Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d14018cd9ce9c44…

MALICIOUS

PDF

44.5 KB Created: 2020-08-01 13:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5569673062c5085945b5de3b85fee3a SHA-1: 5199af2bd782c35e62e28e5754e04a1951303ed0 SHA-256: 6d14018cd9ce9c440dd203fdf8efe1f5fc43ac9faf149ae6728353199387a276
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. The document body, though partially corrupted, contains the malicious URL and references to other benign-looking PDFs, likely as a distraction.

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=git+merge+last+two+commits
    • http://files.cmleukemia.com/uploads/1/3/1/4/131453499/3835673.pdf
    • http://files.inaroadchurch.com/uploads/1/3/0/7/130775362/litogipeb.pdf
    • http://files.outfitterswig.com/uploads/1/3/1/6/131606094/6046343.pdf
    • http://files.motionxsynergy.com/uploads/1/3/0/7/130775228/6288533.pdf
    • http://files.catawbacountyfood.com/uploads/1/3/2/8/132816096/471d87fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/0381/1739/files/83188903596.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/essentials_of_stochastic_processes_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/51160912439.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/tibumojazelenigakirag.pdf
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/xesiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/16181742405.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/fenik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0581/2629/files/sigexajiwesuguruzido.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6734/files/xawexurerozexujezuna.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/41545828987.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/linafejatujonavosit.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/warazejetuketemerevekis.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_off0000622b.bin
2cc0fa597893dde49927ea4b637a91d24d8b73aad83b725232e34d62e0c6e439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622B 5244 bytes
font_01_sfnt_off000073fe.bin
a6c4944d6ba03c2dc5784fceaf37c3cca75153b020f9d65444b91ee22fcc2018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73FE 15476 bytes

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