Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9424608ed9cb4d…

MALICIOUS

PDF

45.7 KB Created: 2020-08-13 19:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3894032ef9f09a0ebe6e9228c14b0b4 SHA-1: a2fe55f4f45e6e8fcc4d77f0b42c5a35bbd720e6 SHA-256: 4c9424608ed9cb4d2607f4d9784b82274f99c62c9823a27269dbdea2ee8d7907
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the ultimate destination of the malicious content. Another heuristic indicates a 'link farm' with 16 external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through seemingly benign domains. The document body itself is heavily obfuscated and contains the redirector URL and several shopify URLs, some of which are confirmed benign, but others are unknown.

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=african%20history%20pdf%20books
    • http://files.voicesfoundrep.com/uploads/1/3/0/7/130739910/sexonoko.pdf
    • http://files.electricstormecigs.com/uploads/1/3/1/8/131871651/cf4523.pdf
    • http://files.thegreatwines.com/uploads/1/3/1/1/131163841/posawinuboju_bekazuje_suwapomot.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/62379857251.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/59697317519.pdf
    • https://cdn.shopify.com/s/files/1/0439/0541/7371/files/90449694875.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/duvewewop.pdf
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/lagabadurotijotu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0367/4785/files/duwugidamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/gpu_boost_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/briggs_and_straton_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/3641/5899/files/basics_of_electrical_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/57669440561.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/hyundai_creta_2020_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/4189842412.pdf
    • https://cdn.shopify.com/s/files/1/0429/3070/0455/files/60426211091.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_off0000703b.bin
370a3803e3f68c4a494d8d2c97ab1804eed6e69abca130e9e0e85950b145c3c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703B 5504 bytes
font_01_sfnt_off000082e1.bin
ef9f84bf251b2b6c3a10c42cf238fc8052ca6ea1a4f3952f4f1a382eae686b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E1 11472 bytes

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