Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c95f674338bb84f…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 04:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4a84f368f8165b006f478b8c90fb35f SHA-1: d43bfda7d3ba7fa8247da05b98ad2d85717e4668 SHA-256: 1c95f674338bb84f7783bdbd423b7e93a18fe9a7d88e2d9cee9f1ec533553ae8
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.cc) disguised as a resume format for an accountant job. This indicates a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=resume+format+for+accountant+job+pdf
    • http://kasani.maisondeclat.com/uploads/1/3/1/0/131070786/edc99ec10b016a.pdf
    • http://vatuge.heathermakesadifference.org/uploads/1/3/0/8/130874284/sozorufazuwojetamute.pdf
    • http://files.placerconservation.com/uploads/1/3/2/8/132815298/debudovipiso_jetugivu_luminir.pdf
    • http://files.jmn-i.com/uploads/1/3/0/8/130814642/badegumun-vafadivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/lowes_marquette_mi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/nuclear_throne_weapon_id.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9369/files/natomoxexebozuletivuwo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/algebraic_expressions_and_identities_class_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/vedusinazezuvajatexag.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5148/files/how_to_find_centroid_of_a_triangle.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/77132524120.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/70650905299.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/46518000737.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/28033558273.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/54537404108.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/94469174861.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_off00006fa2.bin
a2ed31ddfdc7c2b282cec7781aeadb51db5b64165dcdcf78a6f7a2f872c9eb01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA2 5492 bytes
font_01_sfnt_off00008237.bin
a757d97c89dee9ad6763dd3696c861bba979a0c12054110a6fdce03e0aea5672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8237 10516 bytes

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