Malicious PDF — malware analysis report

Static analysis result for SHA-256 2441a16f2f0892bc…

MALICIOUS

PDF

39.5 KB Created: 2020-08-14 16:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd7c16cc98c27139fbad3969a81b6705 SHA-1: 3d5dedfcf10dd0e9af49eed4224fed1356315d5f SHA-256: 2441a16f2f0892bcc5c6430361e754e9c06c84a7785a04f797e704d81b2f813b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/pify?keyword=line+dance+step+sheet+havana+cha'. This URL is likely part of an SEO spam or link farm operation, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous other PDF links, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the redirector URL and several Shopify URLs.

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.ru/pify?keyword=line+dance+step+sheet+havana+cha
    • http://wakun.stjamescheboygan.org/uploads/1/3/0/8/130813042/fanoxegika.pdf
    • http://files.chicagofreeforall.com/uploads/1/3/1/4/131483955/rivixuw.pdf
    • http://files.bethgabow.com/uploads/1/3/0/8/130874075/vorodopaxud.pdf
    • http://files.ahigherlove.org/uploads/1/3/1/4/131482886/1863395.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/76998235161.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/kegogixidiginala.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/lorefazovukuvow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/39322659673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51439980706.pdf
    • https://cdn.shopify.com/s/files/1/0432/5962/5627/files/60204963771.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/interview_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/lightning_mcqueen_name_cars_name_tag_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/5045/7505/files/ccna_report_file.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1996/files/taxesed.pdf
    • https://cdn.shopify.com/s/files/1/0429/2709/5967/files/balirusevizixokewixaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2122/2567/files/car_games_parking.pdf
    • https://cdn.shopify.com/s/files/1/0429/6943/2230/files/fomorovexurereg.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000516b.bin
610331f3473718f89333ed33801905f2aeb472ac7b83edfa290f25c21ed1e5e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x516B 5032 bytes
font_01_sfnt_off00006290.bin
646427228c0e21d0517d46d3298619aabd3b9b4446517b766d01b662b584e827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6290 15052 bytes

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