Malicious PDF — malware analysis report

Static analysis result for SHA-256 733dae21c4539af3…

MALICIOUS

PDF

48.0 KB Created: 2020-08-01 20:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6248d06f0fd3d73b8c5061ca477b26a8 SHA-1: b0d452ed9b741a81fcf461dcc108df2300c82a78 SHA-256: 733dae21c4539af3d2b67f99925416ee1be7952aa33028096b252a217c45eaaf
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to a 'law firm business plan', likely to encourage users to click the 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.cc/pify?keyword=law+firm+business+plan+pdf
    • http://files.wakefieldmeadows.org/uploads/1/3/0/7/130739542/mojum.pdf
    • http://files.sunflowerhouse.waggamatters.com/uploads/1/3/1/3/131398010/a54d0cea60b40.pdf
    • http://files.yogatheartofwellbeing.com/uploads/1/3/2/3/132302768/mizetapisofa.pdf
    • http://files.layzd.com/uploads/1/3/1/6/131636692/7135544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/49211145372.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/crafting_calc_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/mikodi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2222/9397/files/dobirede.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/42439185865.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8136/files/trinity_gm_commands.pdf
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/95237065622.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/lawejananagod.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/kodimulinodutofin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/52729136080.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_off00006fee.bin
c5cf8b87949ce4553d70c9ba9c9838c5db24fad837ac04dce46b461f0be71b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEE 5052 bytes
font_01_sfnt_off000080fc.bin
0fa0f40f092c7d406587b0340fa91b88bca5ec27eb43727b732809d48ac5e52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 10420 bytes
font_02_sfnt_off0000a4ac.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4AC 4324 bytes

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