Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f27070527ec775…

MALICIOUS

PDF

38.1 KB Created: 2020-08-12 08:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ca8d3c9399b0283c6030bce5d852dac SHA-1: ed793d61950c2bedcbfe28e40e4e9f171fce7a2d SHA-256: 82f27070527ec775f1f4b76f46d68f30a36696342606e93eb3c85afd9a6bfdc8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to funnel victims to a phishing or malware distribution site. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as part of a malicious campaign.

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/wb?keyword=vertebrates%20kenneth%20v%20kardong%20pdf
    • http://files.flipconsultants.com/uploads/1/3/0/8/130874610/gajogudaripatuj.pdf
    • http://files.thequiltingretreat.com/uploads/1/3/1/6/131637021/taxuzalosasipid_xedejonabi_rudag_gokukupipugi.pdf
    • http://files.cartonioscornerjewls.com/uploads/1/3/2/6/132681579/7056330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/dezovuwadupewegup.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/32014799042.pdf
    • https://cdn.shopify.com/s/files/1/0432/7879/4917/files/63565652011.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8391/files/4049193200.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/48781907586.pdf
    • https://cdn.shopify.com/s/files/1/0435/3540/1109/files/language_barrier_essay.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/gobinaralujobipig.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/9687573684.pdf
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/kiwewepobawiludow.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/ccna_1_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0440/3652/2149/files/72298620389.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/java_script_count_down.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_off00004a68.bin
c7098cb30293725bd6b883f3c1222b1c848a2e896fd16743fb7fded53a27532a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A68 5240 bytes
font_01_sfnt_off00005c2f.bin
c237557be943e265439c3bd63f35e834cf381b29c450804a670f2848142b0e93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2F 9764 bytes
font_02_sfnt_off00007da0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA0 4324 bytes

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