Malicious PDF — malware analysis report

Static analysis result for SHA-256 86022049d9bb6395…

MALICIOUS

PDF

41.1 KB Created: 2020-08-14 13:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3582a141255ba56757d0d9bdab3860ec SHA-1: 2188608a571b9c8e6d1dc40f77f7ca90b5b222e1 SHA-256: 86022049d9bb63956ac4f59c76142698e8bc6c600a5b4d6e02e95ea387685d79
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, includes text related to 'free books' and the malicious URL, suggesting a lure for SEO poisoning or traffic generation. The ML classifier strongly indicated maliciousness, supporting the presence of malicious links.

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=basic+digital+electronics+books+free
    • http://files.bluesteeltm.com/uploads/1/3/1/4/131453902/4542377.pdf
    • http://jinetu.lineindraft.com/uploads/1/3/1/8/131871991/buxenowe.pdf
    • http://bebisoxal.creativeiphoneography.com/uploads/1/3/0/7/130775940/d64125fe.pdf
    • http://pewego.greenwaynurseryandrainbowclub.com/uploads/1/3/1/1/131163635/2191879.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9529/3094/files/b._p._lathi_signal_processing_and_linear_systems.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/charing_cross_road_84.pdf
    • https://cdn.shopify.com/s/files/1/0441/2804/3160/files/vegesizonimatubuloji.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/ximinawowifuweja.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/44449120456.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/4711880174.pdf
    • https://cdn.shopify.com/s/files/1/0429/6084/7004/files/nfl_teams_by_division.pdf
    • https://cdn.shopify.com/s/files/1/0427/4749/4567/files/knee_pain_exercises_arthritis.pdf
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/acceleration_questions_gcse.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/noxebojemarofixavu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/daroroveruv.pdf
    • https://cdn.shopify.com/s/files/1/0441/1123/3176/files/download_bhagavad_gita_in_tamil_in_format.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_off000056a8.bin
40fb0f5225a45da66f39c324c53c8735aaa0d8ef69935149fd8df8abb6b63327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A8 5444 bytes
font_01_sfnt_off00006926.bin
2d35fe1b112251630f6c3e185fb4bf58c6327cea99f60afab3ca0473214b5b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6926 2116 bytes
font_02_sfnt_off000072f2.bin
258a61c7dfd537647740726006e09c7294e9ce6f15119c53c41d9fbc29c515e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F2 10100 bytes

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