Malicious PDF — malware analysis report

Static analysis result for SHA-256 a769138ed20b7925…

MALICIOUS

PDF

37.8 KB Created: 2020-08-29 22:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c2f020a64859cf51dd5da5b13977225 SHA-1: 3210408b993204ce5d5eb72a6817b36393c24b45 SHA-256: a769138ed20b79255018b22e4ccde60c3185de3d73327b23d7ad2105dbdcdce7
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous embedded URLs. One URL, 'https://ttraff.ru/wix?keyword=vrin+analysis+example', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the malicious redirector URL, suggesting its primary purpose is to lure users to malicious sites.

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/wix?keyword=vrin+analysis+example
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/tolebamutetop.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/82350304640.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/wigikarutopizujatu.pdf
    • https://cdn.shopify.com/s/files/1/0462/7762/3957/files/irs_cancellation_of_debt_insolvency_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_b818b6c3533a4e4dbe5128b69367856b.pdf
    • https://cdn.shopify.com/s/files/1/0429/8434/1657/files/90654437741.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/85251808772.pdf
    • https://cdn.shopify.com/s/files/1/0437/5560/2078/files/reporter_amharic_mereja.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1362/files/analyses_biochimiques_du_sang.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2127/files/mirixarapofusesosofowapa.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_off000057a9.bin
1a5224cfbb2c33d008db7296667236eed2caaaf4365bce7d412d9e197392bedb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A9 5100 bytes
font_01_sfnt_off000068fb.bin
620c6abf699ab53ad7d17ab205bb6037e5cffd2597e81fa1a2b96be1399304cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FB 9988 bytes

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