Malicious PDF — malware analysis report

Static analysis result for SHA-256 8358f608db27a494…

MALICIOUS

PDF

41.5 KB Created: 2020-08-07 15:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ea3962e434f302abe9629e677a02d56 SHA-1: 417870c68e8baa7fa5b910c4e83092a895319094 SHA-256: 8358f608db27a494687f932c28a03f8aa3bdeb9b7da7dd9162e8e3d0062a3043
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body itself is heavily obfuscated and contains the malicious URL, reinforcing the redirection attempt.

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=consonant+phonemes+pdf
    • http://files.rosehavengoldens.com/uploads/1/3/2/6/132681758/fd11dda12a.pdf
    • http://files.carsnc.com.au/uploads/1/3/0/9/130969935/kijof.pdf
    • http://files.tinagutierrezartsphotography.com/uploads/1/3/0/7/130775383/remax-taxopugazaledu-fuluxibejurifuj-lavosiraleset.pdf
    • http://givuxes.robmunk.com/uploads/1/3/0/8/130814124/gegudegedake_zojibutenemirir.pdf
    • http://files.robertgoldenfineartltd.com/uploads/1/3/1/1/131164462/savuwidumix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/76436587707.pdf
    • https://cdn.shopify.com/s/files/1/0427/6423/9014/files/mamevuvomewetukit.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/49273985301.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/zagenaxijadenewidusodat.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/4311759555.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/42634358526.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1632/files/definition_of_health_economics.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/kukeligubuvadogupigojema.pdf
    • https://cdn.shopify.com/s/files/1/0429/0193/0143/files/3007678553.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/99749488129.pdf
    • https://cdn.shopify.com/s/files/1/0434/0698/3318/files/brew_install_python_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/35850773304.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_off0000653a.bin
13662ac1eb1126cfeb4d7c4c69842649b4578326c72ddcba4648f1a4cafb662e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 5060 bytes
font_01_sfnt_off00007649.bin
598cd19ac6262e8223f6584607ebbdae1281d6df4130d3e7ca9adc3aa214aaad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 10168 bytes

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