Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cd1105099f6c6e…

MALICIOUS

PDF

41.9 KB Created: 2020-07-09 14:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76389408f48b2739d688ab2ba9317685 SHA-1: e954fd4c97700cc69732762436997e071b3d4bd7 SHA-256: f2cd1105099f6c6e8618cd8b62b402d585e2663c377e75131aab13f5ca5413c9
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'textbook on rheumatic diseases pdf' and mentions the wkhtmltopdf generator, suggesting a lure to disguise malicious redirection as a document download. The primary attack pattern involves tricking the user into clicking a malicious link disguised as a resource download.

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.com/wb?keyword=textbook%20on%20rheumatic%20diseases%20pdf
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdf
    • http://files.fusaroconsulting.com/uploads/1/3/1/6/131637695/626c0bf616cdb78.pdf
    • http://files.outcomemedia.com.au/uploads/1/3/0/7/130738845/folufa_xuxatuketodij.pdf
    • http://files.mafhaus.com/uploads/1/3/1/3/131380251/31c1e35ef43547.pdf
    • http://files.refineaestheticsllc.com/uploads/1/3/1/4/131438642/xewef-pufivugabud.pdf
    • http://files.williamsburgrec.com/uploads/1/3/2/6/132682745/tagogumolizim_fofuzipupi.pdf
    • http://files.nalinikrishnankutty.com/uploads/1/3/0/8/130874128/mewajuluxojuvafox.pdf
    • http://files.kproductionservices.com/uploads/1/3/2/7/132740498/304e2dbdb.pdf
    • http://files.orsolyaivanyi.com/uploads/1/3/1/0/131070527/4853482.pdf
    • https://lininolo.files.wordpress.com/2020/06/sajenajuxajoredus.pdf
    • https://potataz.files.wordpress.com/2020/07/duminerukojaxodaliwuvij.pdf
    • https://tasifad313954747.files.wordpress.com/2020/06/tinixafejudumes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/57308776079.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29426312843.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.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_off00006431.bin
d8e1c144c097d69492289bc99e191ee1434082b96a103e86c4df10b8468cde88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6431 5464 bytes
font_01_sfnt_off00007690.bin
1362f2af8b554bf5f0ca55fca70d194724d018528e2cbba2eb43cca136fc74e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7690 10164 bytes

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