Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b8d22b115304f3…

MALICIOUS

PDF

72.2 KB Created: 2020-07-18 23:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a51ebd65a28fdedda6c0e93951253d9 SHA-1: 0e174cbacd8ddf2009340da556d38a9bb031ccfa SHA-256: 55b8d22b115304f373de67cc136c5fe6f2eda64cd273254e1ef8739cd136f75f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru', which is part of a link farm. This indicates an SEO poisoning attempt to lure users to malicious sites. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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=hp%20dl380%20g5%20manual%20pdf
    • http://files.bieronskied.com/uploads/1/3/1/0/131070212/jikuluxe_kimulatir_dumexenibadexav_kalotas.pdf
    • http://files.myheartmystate.com/uploads/1/3/2/7/132712199/06d18c6.pdf
    • http://files.joeraineri.com/uploads/1/3/1/4/131438427/a719f79f69373b.pdf
    • http://files.bieronskied.com/uploads/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/movitone.pdf
    • https://cdn.shopify.com/s/files/1/0431/2950/3908/files/nuwizatura.pdf
    • https://jiwuvef.files.wordpress.com/2020/06/kiwugasorupo.pdf
    • https://guvemajik.files.wordpress.com/2020/07/zozetilo.pdf
    • https://wuvalitez.files.wordpress.com/2020/07/zusapakovozaju.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/83512182111.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/rareb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gijamibumiji.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/jelojunaropow.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5688/files/44982530099.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/6044140433.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/42546159558.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/63439776996.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_off0000e0d3.bin
8802a795a861b24d3e824a7dd93c3e528dbe3b42623d9c7dba32d2c11a3f8e83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5200 bytes
font_01_sfnt_off0000f266.bin
84c0ac346022e5cd6f82676b4b14c2821827042d2ea9d9e101e4efb1e2a0e886		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 9836 bytes

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