Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc897a9a0b28e178…

MALICIOUS

PDF

47.1 KB Created: 2020-08-29 03:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ad6b9e20798c57d65c3f78b7feb1c23 SHA-1: 5b3d21bda7a8072d616d0d1d7b47442ac64b46b3 SHA-256: fc897a9a0b28e178a8a645bea7b7bdc12784dafbba812d262adb7faf350418e0
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on static.usrfiles.com and cdn.shopify.com, suggesting a link farm or SEO poisoning tactic. The primary malicious URL is likely used to redirect users to a phishing or malware distribution site.

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.com/wix?keyword=basket+muzzle+training
    • https://static.usrfiles.com/ugd/b8c837_cfd30181caeb4833b699857a028f5062.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4d157925e36458f937b21fb2563219e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dae7c95d2ea480b9f0a0079271707eb.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/pofetevizalepeji.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/nugiwano.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/97613703931.pdf
    • https://cdn.shopify.com/s/files/1/0462/4629/7751/files/30188048.pdf
    • https://cdn.shopify.com/s/files/1/0437/4819/6503/files/argumentative_writing_format_igcse.pdf
    • https://cdn.shopify.com/s/files/1/0433/6327/0815/files/widegasozel.pdf
    • https://static.usrfiles.com/ugd/b8c837_89d5308107374ac8927f28b604a1b444.pdf
    • https://static.usrfiles.com/ugd/b8c837_3999fb05c3bf448d8adbba81ce1d73e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa303996bf77468ea87058cdbfdc377c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdeea24ea27f4720a59cad1fc6193a53.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce1e48244c014206ba6b39bce20c7902.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_off00007b92.bin
dc0c90190d6e267cabe77f0b65ac02d07010b2b1d3a0c9085356b171cb9a9863
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B92 5168 bytes
font_01_sfnt_off00008d13.bin
d1907ef55e9eb9e1870ba2ea773481d98ae3de95362ffe0eaa7f6a5489c4f0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D13 10068 bytes