Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f41be227cf83950…

MALICIOUS

PDF

39.7 KB Created: 2020-08-25 03:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d453ac2286ad12e15d3dc67bd791c34 SHA-1: e262d4257ab30c28b0529e5e16904283c85933ec SHA-256: 4f41be227cf83950c304100c1571438ad90223114942fdb3b8edec2a7a600da0
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector at `ttraff.cc`. The document body, though heavily obfuscated, contains the URL `https://ttraff.cc/pify?keyword=fax+face+sheet+pdf`, suggesting a lure to disguise malicious activity as a legitimate document. The presence of numerous other PDF links indicates a link farm strategy, likely to improve SEO for malicious content or to distribute the malicious links across multiple benign-looking documents.

Heuristics 3

  • 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.
  • 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=fax+face+sheet+pdf
    • http://files.thedoosra.net/uploads/1/3/1/4/131452903/976208.pdf
    • http://files.thewolfpackpodcast.com/uploads/1/3/0/7/130775102/e649d7.pdf
    • https://cdn.shopify.com/s/files/1/0435/1682/1672/files/strength_of_materials_important_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/gipix.pdf
    • https://cdn.shopify.com/s/files/1/0462/6389/4173/files/musopoxebuwoxuzupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8190/7870/files/astm_a572_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/91114263691.pdf
    • https://cdn.shopify.com/s/files/1/0436/3105/0905/files/github_create_new_repository.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/92901608083.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0012/files/bsf_application_form_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30551251375.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_off00005e66.bin
cf6a0bb2d33943b6f242869d8e7bc27ca9f9c92af0e5c15f966b6afc0866f44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E66 5140 bytes
font_01_sfnt_off00006fe9.bin
7b48ded7f985ae1a830068ada0cb928110ca419014504ef75109e968e431ce0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE9 10128 bytes

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