Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8b9a51c31e1e40…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 12:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e457f20f3b25f0e2b89984b5d93b16 SHA-1: 47ea91d8080b67b9a5541b776aedeb9c89234a33 SHA-256: 7a8b9a51c31e1e409eb08834119ae6b76cf288e3f26876b6378396c3c5cde17b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.cc/wb?keyword=hueso%20temporal%20anatomia%20pdf`. It also exhibits a link farm pattern with numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and other benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/wb?keyword=hueso%20temporal%20anatomia%20pdf
    • http://files.philippecorriveau.com/uploads/1/3/2/8/132815045/7454995.pdf
    • http://files.backtothepastresearch.co.uk/uploads/1/3/0/9/130969632/032e3bea2a762.pdf
    • http://files.cegyan.com/uploads/1/3/1/4/131407194/liremikisesagitozuxa.pdf
    • http://files.timmy-the-cat.com/uploads/1/3/1/4/131410606/4032577.pdf
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/80259489313.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/fawarutimagisofi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1079/1323/files/28042697374.pdf
    • https://cdn.shopify.com/s/files/1/0437/8601/0776/files/numerical_methods_for_engineers_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4589/files/8848510994.pdf
    • https://cdn.shopify.com/s/files/1/0450/2500/1630/files/taxinosoxonurixafid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/pomobivarunemoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2524/files/chapter_24_scarlet_letter.pdf
    • https://cdn.shopify.com/s/files/1/0436/5156/3670/files/poxes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0082/2934/files/historia_carabineros_de_chile.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/xipolelitakozexidaxogegug.pdf
    • https://cdn.shopify.com/s/files/1/0440/3403/1766/files/billies_bounce_bb.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c0.bin
5fac5dacda37e7bf5ef99201b4e5bf70365de64129d6eb1022a17ac1f999bc46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C0 5148 bytes
font_01_sfnt_off00008626.bin
4609b7c0e59c76898924801dff26b898d5f9f4231610fc0a3dbda4ba1eda1812		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8626 10972 bytes

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