Malicious PDF — malware analysis report

Static analysis result for SHA-256 af74a0bfff502f61…

MALICIOUS

PDF

46.7 KB Created: 2020-10-30 10:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a6e4514fba6ea9b7796f1cc8cbf9aedc SHA-1: 8338b5b69f37ff6c0b454e5121be7c903932f021 SHA-256: af74a0bfff502f617ce45b15e3467eae25ddaabb8e44bc517fd97957f5583977
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the presence of numerous links points to a link-farming or redirection-based attack.

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://ttraff.me/pify?keyword=dark+souls+randomizer In PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/dibasaxaseke.pdfIn PDF document text
    • https://sasenepekevob.weebly.com/uploads/1/3/4/2/134266747/nuwereneko_xalasudop_rinozijusob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kawotexulozax/words_start_with_letter_g.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/letter_from_birmingham_jail_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/84349712116.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/spanish_christmas_songs_from_puerto_rico.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/mahalaxmi_calendar_september_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05912f23-9b3f-4af7-8345-c115490ed11f/55253134940.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/usmc_harp_form_order.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/grade_9_english_module_anglo-_american_literature_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/gekijiborubawupalovagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1058/7296/files/zegatigajopana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8560/6296/files/juduwiruxokagorexar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b9a6591-3374-4838-ab72-3c3f9556d8cd/5544232422.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD1 4888 bytes
SHA-256: 369e59ebee4fca4b67092e019bc953e5cd8b6eb2b2fb2a6c1798df50334a130d
font_01_sfnt_off00007c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C56 10488 bytes
SHA-256: cb55271e16bfd6756efde3f2f6582e34c0f321151379a2cb5e9a8d6e6655dcb8
font_02_sfnt_off0000a01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA01A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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