Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c21b57228e9d808…

MALICIOUS

PDF

36.3 KB Created: 2020-08-07 19:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00169259caa7191b8233af083291adeb SHA-1: 6d107859bb8a26e22a2b0547dca81cca8df64497 SHA-256: 7c21b57228e9d808f93a02bf4c693ac6bb5e513ed3d1a3112c92d218d3b33553
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.cc/pify?keyword=skf+linear+bearing+catalogue+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links and the redirector indicate an attempt to lead the user to malicious content.

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.cc/pify?keyword=skf+linear+bearing+catalogue+pdf
    • http://files.trevelle.com/uploads/1/3/2/6/132682235/4880750.pdf
    • http://jolure.cowgirlastrologer.com/uploads/1/3/1/4/131409090/79c67866d55f.pdf
    • http://files.njoylifecoaching.com/uploads/1/3/1/3/131381480/1102247.pdf
    • http://files.alabamasigmas.org/uploads/1/3/1/3/131380292/2194312.pdf
    • http://pezuz.alternativecustommillwork.com/uploads/1/3/2/7/132740900/jezujota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3032/3095/files/nanostructures_and_nanomaterials_synthesis_properties_and_applications.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/tiwowetavevener.pdf
    • https://cdn.shopify.com/s/files/1/0432/1715/8312/files/85001765073.pdf
    • https://cdn.shopify.com/s/files/1/0443/8907/3062/files/geometric_nonlinear_functional_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/90799582123.pdf
    • https://cdn.shopify.com/s/files/1/0434/4021/0072/files/gilusuweb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/4077026649.pdf
    • https://cdn.shopify.com/s/files/1/0436/9137/6794/files/30380521645.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/97903005223.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_off00004fee.bin
5aa44056937c3067eb3ab4ecbba5bad76b6a39ef0adcddf3d66d392074f6d16a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEE 5452 bytes
font_01_sfnt_off00006287.bin
54892efbcb7d48f288ee377d8fcbad068be243ca3b909e8b59a77087966488a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6287 9964 bytes