Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66583f0c2eb212e…

MALICIOUS

PDF

62.3 KB Created: 2020-08-30 00:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d0489a0b01e8485fcfe6776b07a78bb SHA-1: f9af8a960aa2d82b484ac63f56a20a68f033e7f8 SHA-256: e66583f0c2eb212e3c6706a63356b879aa82e55fa9e2cf7193b5fed3d5a28e17
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.com/wix?keyword=bootstrap+input+file+upload, which is likely used for phishing or malware delivery.

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=bootstrap+input+file+upload
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/16497370615.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/56663554960.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/mamuro.pdf
    • https://static.usrfiles.com/ugd/b8c837_f85d765a816a4ec080ce057d9bc9f162.pdf
    • https://static.usrfiles.com/ugd/6846fe_937c5a4bef294ee98018de9e8ad27ba9.pdf
    • https://static.usrfiles.com/ugd/54fa57_be5e812b3f034328b3377c481ca8c63d.pdf
    • https://static.usrfiles.com/ugd/63022f_d86ff279f772411784a0ea759cda0085.pdf
    • https://static.usrfiles.com/ugd/b8c837_0112073a40784c0b8b3ba496522f7bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b108469c8e0340d8b80129a5f301a737.pdf
    • https://static.usrfiles.com/ugd/55cc32_17d7c5dbacca4e73ab482219b5af3a93.pdf
    • https://static.usrfiles.com/ugd/5899d5_28483782634042bea79cfb38450da802.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_66e5190cb0714e08bffa376c8bca3f57.pdf
    • https://static.usrfiles.com/ugd/3bca44_e0e79653f46b4d05b12e0a4b7899319e.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_off0000a676.bin
85c32ed5d03e0ac0c018c458cd5a4580d84629fde56f5346747da6667d13d9f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xA676 5084 bytes
font_01_sfnt_off0000b7cf.bin
fcc47ccfaa728637d3e589c1e394c3bd26fa45b100143348107a1bd9b82a1ece
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 17164 bytes