Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0c6e72c81b690d…

MALICIOUS

PDF

44.5 KB Created: 2020-08-01 20:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ae59880cc7a5b1497f5e2ff807bde55 SHA-1: 4533f131a324a6b8b19e349719854d428616e902 SHA-256: 6d0c6e72c81b690d2df0ea8e45cc4fc714ba86d5250d01cebdbebb3de8ff53e5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious content. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to other PDFs, suggesting a broader campaign to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious distribution effort.

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/pify?keyword=mortal+kombat+super+nintendo
    • http://files.stencilgenie.com/uploads/1/3/1/4/131409305/rubazagix-pusokodefetej.pdf
    • http://files.tomfoolerytoys.com/uploads/1/3/1/6/131636728/kedorob.pdf
    • http://files.killjoy.info/uploads/1/3/2/8/132816158/444fa6d86d0810f.pdf
    • http://files.erinsusannephotography.com/uploads/1/3/1/0/131071209/eb719f7d241.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/78399215354.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/96739814623.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/nesifawenozo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/lupigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/6442691589.pdf
    • https://cdn.shopify.com/s/files/1/0430/5590/6970/files/koxizofexasetilobobofifow.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/wolaleditiraba.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/98739304951.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/27897011673.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77636621448.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/57831822719.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_off0000711a.bin
29ef77998f777c5dd6e0ea8a56cee1c3e1c82a06abfa80c3cbe4de6240b5adb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x711A 5312 bytes
font_01_sfnt_off0000830f.bin
04133027c927a96627eb2a94a00d19d74400e97c870ed1638c898559865f3579
pdf-font-stream PDF embedded font (sfnt) at offset 0x830F 10108 bytes