Malicious PDF — malware analysis report

Static analysis result for SHA-256 756fb78dffee3528…

MALICIOUS

PDF

44.0 KB Created: 2020-08-03 22:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f66d0fc67b1a7a0015b61aa2053ccef SHA-1: 2fcc59663d55e368b547a2dfeb792a4fb7327514 SHA-256: 756fb78dffee35289a1f517f398c7e468382515e34825b7bf44d970072ff3bae
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=english+learning+books+for+kindergarten+pdf`. This indicates the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

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/pify?keyword=english+learning+books+for+kindergarten+pdf
    • http://files.texasfinesse.com/uploads/1/3/2/8/132815003/b896a412.pdf
    • http://files.benbloor.com/uploads/1/3/1/6/131606733/devapeguzowosujewum.pdf
    • http://files.unanapsychologist.com/uploads/1/3/0/7/130775912/0beaa17016caa4f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/47831050273.pdf
    • https://cdn.shopify.com/s/files/1/0438/3080/4637/files/28490280654.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/terukijev.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/sifekonige.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/38167954996.pdf
    • https://cdn.shopify.com/s/files/1/0429/3964/6108/files/she_s_so_unusual_album.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/zizedepavodawowafuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1304/4386/files/1336543698.pdf
    • https://cdn.shopify.com/s/files/1/0434/4093/0983/files/83991678876.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/zokagewuripil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/xokuvuvenexepevejuwava.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/matukatezunufovuvoxixop.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_off00006099.bin
f942201266105c61441b20c88377b6f6edeb74a66cea804d90e85f87a89f4f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 5252 bytes
font_01_sfnt_off0000725b.bin
41d4453c1e503591850343ed61dc710b4dfc3addea9a2283f26ed9a0cf2ec23a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725B 10044 bytes
font_02_sfnt_off000094b4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B4 4324 bytes

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