Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8f2730e75fd200…

MALICIOUS

PDF

44.1 KB Created: 2020-09-02 06:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 480915ff088fec808ebe0a3ef1a1f246 SHA-1: 1350807711e0aaf5fcf43a88e08fd4af5e06b69a SHA-256: 0b8f2730e75fd20096913c73b5e30d0ec3055305424e27cdc790030745a691d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link, 'https://ttraff.me/wix?keyword=gst+audit+checklist+in+word+format', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links, indicating a lure to malicious infrastructure.

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.me/wix?keyword=gst+audit+checklist+in+word+format
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/15d534_936561990a164dac80120757d0159222.pdf
    • https://static.usrfiles.com/ugd/628a76_78fb9af5e0934fbfb9d39b2a01df6999.pdf
    • https://static.usrfiles.com/ugd/963627_e4486234fe5341329126ec19b7dffc10.pdf
    • https://static.usrfiles.com/ugd/b8c837_29722c605d6244a189447036c365eea1.pdf
    • https://static.usrfiles.com/ugd/12dc78_9c98d0c49128438fba3ed0f5e5079dc4.pdf
    • https://static.usrfiles.com/ugd/3b0c81_f6002127df144e56a6e2cc9d77819558.pdf
    • https://static.usrfiles.com/ugd/b8c837_e023013883454fd4b69c07d462d57702.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/movizesimuvo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/hospital_logo_design_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/7062/7735/files/vetunemesibiv.pdf
    • https://static.usrfiles.com/ugd/b8c837_254ebbe9ffd049d0828336d166946970.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1017a7d1e614278aeca2023679385cf.pdf
    • https://static.usrfiles.com/ugd/362633_749dc11820b8484cabf7cc4efbaba882.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_off00006df5.bin
9458a3befea8d1b20c5160ab670c682f6e8038a1846793431d0798a1da8395df
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF5 5448 bytes
font_01_sfnt_off00008069.bin
a457cb858a615d9b403e67f07e9a27298f9e135517e3d95c933a3ec3e0f9a136
pdf-font-stream PDF embedded font (sfnt) at offset 0x8069 10360 bytes