Malicious PDF — malware analysis report

Static analysis result for SHA-256 7556ff9295d18136…

MALICIOUS

PDF

36.8 KB Created: 2020-08-26 19:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0240358c4816541ac835d851666def5 SHA-1: 1bea33f187dc5b1a4a7a2dd5a8d50d575a8577c2 SHA-256: 7556ff9295d181369823472551d449c79e8d20ee5341433d7a0e2075c360d78e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=chairmaker%2527+s+notebook
    • http://vogif.clairehinchman.com/uploads/1/3/1/3/131380600/125feaa9434.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0453/8872/6440/files/biology_102_final_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/0207/6070/files/woxekipejor.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/african_history_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/putajidigijomanepezo.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/60484081649.pdf
    • https://cdn.shopify.com/s/files/1/0435/7373/9675/files/lubelotise.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/kugiketajiw.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054ae.bin
29742a3a54418bb725d8e73f97042425f84a5daa1f3d74ba66c8b0de72f747d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54AE 5036 bytes
font_01_sfnt_off000065aa.bin
dce6dfaa2b5989b4127a2361436446d3901eec43b6e8dfac477fe98b233626ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AA 9796 bytes

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