Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d088362c8ab061…

MALICIOUS

PDF

57.0 KB Created: 2020-07-08 21:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 65bcf4a0eb82ed85738a61d10938f405 SHA-1: f1a5fccd7a4ef74359747481935e05b213455088 SHA-256: 54d088362c8ab0619634bb027c06d5ffdd54a7f32e0287052498404bf53fd391
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure text suggesting a syllabus, but embeds numerous links to external PDF files hosted on various domains. One of these links, 'https://ttraff.ru/wb?keyword=ldc%202020%20syllabus%20malayalam%20pdf', is identified as a malicious redirector. The presence of a visual download button further supports the malicious intent of directing users to potentially harmful content. The document's primary function appears to be a link farm designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=ldc%202020%20syllabus%20malayalam%20pdf In PDF document text
    • http://files.termarkleather.com/uploads/1/3/2/6/132682665/85b01c3aa355523.pdfIn PDF document text
    • http://files.fresnonutritionsolutions.com/uploads/1/3/2/6/132683111/9806049.pdfIn PDF document text
    • http://files.helptakeaction.com/uploads/1/3/2/6/132681938/3009213.pdfIn PDF document text
    • http://files.housewifepreneur.com/uploads/1/3/0/9/130969603/zugej.pdfIn PDF document text
    • http://files.technoirmusic.com/uploads/1/3/1/3/131380001/2fa924.pdfIn PDF document text
    • http://files.chenowethbairddesign.com/uploads/1/3/1/8/131871894/kawal_fudomur.pdfIn PDF document text
    • http://files.professionalcapitalpartners.com/uploads/1/3/1/4/131438766/4121815.pdfIn PDF document text
    • http://files.londontoursatnight.co.uk/uploads/1/3/2/7/132740501/1f21781da57f.pdfIn PDF document text
    • http://files.pst4y.org/uploads/1/3/0/7/130738814/piwagitasesesuwatug.pdfIn PDF document text
    • http://files.todayhousing.com/uploads/1/3/0/9/130969243/vanamogukalazak.pdfIn PDF document text
    • http://files.mrstuckeysclass.com/uploads/1/3/0/7/130776841/4143467.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • https://fanutuzak499104460.files.wordpress.com/2020/06/pebexasuwasunitekupex.pdfIn PDF document text
    • https://padububoxu.files.wordpress.com/2020/07/pamigipowatafolufa.pdfIn PDF document text
    • https://zumanolunaze.files.wordpress.com/2020/07/fesegiroderibokijawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E6 5084 bytes
SHA-256: 6e4ca0aba8d507cfef22136b1a5c941f366e8b5c00a46caeb6d4987f3c496825
font_01_sfnt_off00007823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7823 2840 bytes
SHA-256: f9f1b60e4f88f3b0a7bcbb87c6d6b9b0e1e97da8004aceb18220dbe2b715baaf
font_02_sfnt_off0000835f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x835F 5684 bytes
SHA-256: ba3d498fb0265f06a5e059d6578b2446085df1d7fc6bf2db694160321929a8d7
font_03_sfnt_off00009301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9301 14052 bytes
SHA-256: 9f3b7ae9951221d39b03a3fa16267a5217ea91a4741886577f7220b8e7f10013
font_04_sfnt_off0000be35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE35 16696 bytes
SHA-256: 57985312c2126316f317fe38bbbe12f17fafe175f2604ad106bdde9bcb1784c9

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