Malicious PDF — malware analysis report

Static analysis result for SHA-256 80cf67162d48a242…

MALICIOUS

PDF

45.8 KB Created: 2020-08-21 20:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7497a1236dc8a9271390761f5ffebe22 SHA-1: bfc3d81d8120e199604170a33db153627122d0b8 SHA-256: 80cf67162d48a2420332dee21099855a3a473d25eb9c6fc612d74505d774e1b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to benign Shopify URLs, but one primary link redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. No scripts were extracted, but the document's structure and link farm indicate a malicious intent to redirect users to harmful sites.

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.com/pify?keyword=free+html+templates+for+online+education
    • http://files.stjohnsnl.org/uploads/1/3/1/0/131070202/4341d1b115400.pdf
    • http://pibitab.sparklyshop.co.uk/uploads/1/3/1/4/131483281/5582254.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4756/7003/files/aligarh_muslim_university_history.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/96497114315.pdf
    • https://cdn.shopify.com/s/files/1/0431/0076/6369/files/kalogowiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/zevikimovuxubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/98052704378.pdf
    • https://cdn.shopify.com/s/files/1/0438/9827/3944/files/77442614486.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4502/files/modal_verbs_exercises_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1682/files/yasser_seirawan_winning_chess_endings.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6027/files/xejapu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9928/1821/files/duff_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/kijoditenis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006723.bin
ae1152e382e0d3d6e411af70e4fcc6315e86b58ef1c33b704e08f599f581ae67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6723 5232 bytes
font_01_sfnt_off000078ba.bin
4703aa4e190194fadd1b2518f1aa504384963459e7ef93dc4373211c94c70bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78BA 10304 bytes
font_02_sfnt_off00009bfb.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BFB 4324 bytes

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