Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3fe2f559921729…

MALICIOUS

PDF

38.8 KB Created: 2020-08-30 14:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc57cc75315ff7d655adbeebac5937f8 SHA-1: da494ebe33469fa32a33c18ba164972665395ae7 SHA-256: af3fe2f559921729bfd24c49ef2deb8a34b736133c5c7eadad314f6719ac4031
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous external links. One of these links, 'https://ttraff.com/wix?keyword=profil+ent+college+18', points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL and a list of other URLs hosted on 'static.usrfiles.com', suggesting a link farm or redirection scheme. The primary attack pattern appears to be luring users through a seemingly innocuous PDF to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=profil+ent+college+18
    • https://static.usrfiles.com/ugd/b8c837_20e39a787be1497a9b1ff2e3c267bea5.pdf
    • https://static.usrfiles.com/ugd/74e905_fff94d03a7824c3ebe3b9e9ce700376b.pdf
    • https://static.usrfiles.com/ugd/b8c837_86d3e3027366436b80a3352bdbbf305f.pdf
    • https://static.usrfiles.com/ugd/10e3af_f17d7e8c6a0349269d6d665845be1577.pdf
    • https://static.usrfiles.com/ugd/3b7182_3b9d51c1ae524c9392c486c4a8c0ec0e.pdf
    • https://static.usrfiles.com/ugd/b5aed9_d1a0bf6082eb4c2e903a0b8538666be4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ed68ff68d54656877f64cb1e053e6b.pdf
    • https://static.usrfiles.com/ugd/b11f6d_f5fcdf4fa5e246fba9801cd5783cfa94.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_off00005a80.bin
819e137129320eb46862eaf5ced3f2d81c7ff031651c2da110243785508108d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A80 4908 bytes
font_01_sfnt_off00006b4d.bin
43b8034a108ec3aa14dd1e9da72aa2fc8f354815a671899b1b7cf8b3477d8212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4D 10528 bytes

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