Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ed13bc2f71e55d…

MALICIOUS

PDF

63.4 KB Created: 2020-10-03 12:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cdbae08607698e29e459ab978a23e609 SHA-1: e230c03e2060fa15e3b5fa1a297e988528c3e8eb SHA-256: 31ed13bc2f71e55db8defa6667adaf28048160e4c46160b327c3945afa0f9ee7
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?keyword=mavi+okyanus+stratejisi+powerpoint In PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/lunazajujaxojagituwafiz.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/27683452847.pdfIn PDF document text
    • https://site-1039886.mozfiles.com/files/1039886/12509675757.pdfIn PDF document text
    • https://site-1038454.mozfiles.com/files/1038454/masati.pdfIn PDF document text
    • https://site-1039424.mozfiles.com/files/1039424/49470154561.pdfIn PDF document text
    • http://files.susangeddes.com/uploads/1/3/2/3/132303373/sopasabixazawud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8577/8084/files/45208547835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6377/1293/files/34779285045.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/14754049863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8825/3606/files/87262251745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3806/6856/files/investigations_math_kindergarten.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5161/3351/files/accountant_executive_resume_format.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8484/3682/files/68600707518.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4225/7561/files/luluxulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/87884079598.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8D 3200 bytes
SHA-256: 0bcf9495570ee52b2728a5bd576157f284e2d36b790c0a2f8b0d5ea429112f12
font_01_sfnt_off000098de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98DE 5180 bytes
SHA-256: 627f564730f735adbe793824e1178f239aa97e26ce81711962de22194a57d63d
font_02_sfnt_off0000aaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABA 15532 bytes
SHA-256: 01bbaa1ecbf2b4a7975f61af11e7442f6b1382e47557e6d1107c7dfa4ca24cc7
font_03_sfnt_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 16376 bytes
SHA-256: 4badd2b26dcf31a0eafa3ce1ec92469bac4385617c3d91d08b411b9594837a47

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