Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9fe8641939cae5…

MALICIOUS

PDF

46.9 KB Created: 2020-08-20 19:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c1b7dc78f96243550c46728ce2c1f0e SHA-1: 1893a0f3fc42f88a2827e0a660822d71544745ee SHA-256: af9fe8641939cae52b52d9c8aea0e847172ee16211124d11fc6609967f3bb610
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=reference+letter+template+uk'. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious content under the guise of a template. No scripts were extracted from this sample.

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=reference+letter+template+uk
    • http://fiboxaru.proclaimingfreedomministries.org/uploads/1/3/1/4/131407315/3902409dc2.pdf
    • http://files.jordanback.net/uploads/1/3/2/7/132740804/kanofinori.pdf
    • http://files.rineyvilleoptimist.org/uploads/1/3/0/7/130775817/4679991.pdf
    • http://files.whizkidsprograms.com/uploads/1/3/0/9/130969220/8271253.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/coordinate_plane_foldable.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0439/9998/5822/files/psicologia_anormal_sarason.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/74601426242.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/special_introductory_verbs_reported_speech.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/xapekaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/4549/4684/files/payback_2_mod_apk_obb.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/41711308718.pdf
    • https://cdn.shopify.com/s/files/1/0435/1636/2904/files/94185430019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdf
    • https://cdn.shopify.com/s/files/1/0433/2525/9944/files/97177361930.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/vehicle_dynamics_and_control_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3535/files/lutijewoxozenadojoreb.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_off00007b1b.bin
7106714ad371d10e2d6e79538ed163b6a28958354d1b8a63f2d97f06a0bf8eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1B 5056 bytes
font_01_sfnt_off00008c33.bin
c82b967f186d085fe68061c48c11bbde8b5613efeddc0ee4e05a7a6bb6e22904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C33 10120 bytes

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