Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df1d70628f519b9…

MALICIOUS

PDF

44.8 KB Created: 2020-08-19 20:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59775894f0e353a48ecdb24921a88d53 SHA-1: eba69aa1edab9a9b49879b69dbcbd463fbc72fc8 SHA-256: 5df1d70628f519b98be7882b4f08736d7be2ca5b2dfa674e1479b0380cb93139
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to a redirector and a large number of other PDF files, indicating a link farm. The primary malicious URL is https://ttraff.com/pify?keyword=gettysburg+address+text+pdf, which is flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the PDF structure itself is suspicious due to the mass external link farm.

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.com/pify?keyword=gettysburg+address+text+pdf
    • http://files.cpmyc.org/uploads/1/3/1/8/131857920/savoziguluza_larobidirejufi_wiked.pdf
    • http://fowami.lybodesignerunderwear.com/uploads/1/3/1/6/131606490/sutusepiw.pdf
    • http://files.springgardens11.com/uploads/1/3/2/3/132303374/runerunuzax.pdf
    • http://files.mikimappin.com/uploads/1/3/0/8/130874668/5173735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0456/8471/9775/files/49852242035.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/95986347361.pdf
    • https://cdn.shopify.com/s/files/1/0432/3675/3570/files/pivazinagenomigesuxidebon.pdf
    • https://cdn.shopify.com/s/files/1/0448/1646/6082/files/catia_assembly_design_projects.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3396/files/balarama_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0432/4294/6724/files/zisijodalesunikideka.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/how_to_italics_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0436/1119/3501/files/tekupigugedulomolelibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tapowizilefaj.pdf
    • https://cdn.shopify.com/s/files/1/0465/5366/1590/files/dutokimemesegijirukosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/3354680371.pdf
    • https://cdn.shopify.com/s/files/1/0443/8809/0022/files/melinomizowelegamosag.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_off00006f91.bin
7ee58a67776d482a6db680fc9cd1ba1c2e782ffdef8e49d05649843ddbeac24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F91 5520 bytes
font_01_sfnt_off00008276.bin
4e16c074fb66deef4f312f7518ab2b405764a9d256e94185a8d653f55295e244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8276 10108 bytes

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