Malicious PDF — malware analysis report

Static analysis result for SHA-256 061b6655ee6be58b…

MALICIOUS

PDF

32.0 KB Created: 2020-09-16 00:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5fd94518d5dc1646a131b4af39d340b SHA-1: 8024b2e113fb769f69bd527ba6318581271d19ed SHA-256: 061b6655ee6be58be9a0c361ad4499f4fbe167b6535757c44cdd46fcdb4bd385
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Howard college blackboard' and the URL https://ttraff.cc/wb?keyword=howard%20college%20blackboard, suggesting a lure to a phishing or scam page. The presence of a link farm further indicates malicious intent to drive traffic to potentially harmful sites.

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/wb?keyword=howard%20college%20blackboard
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/4e977a_62d03c58d3b14e65ad9dd229b8ae36a4.pdf
    • https://static.usrfiles.com/ugd/b1b3ad_349d8f0c099d4a42a0cf89a88d89a38a.pdf
    • https://static.usrfiles.com/ugd/ee6770_b893cb0697e64b3fbf7fcdd0ee11987d.pdf
    • https://static.usrfiles.com/ugd/7dd30d_3f8b4bf9f72f4c0bbbe9b5b49399af77.pdf
    • https://static.usrfiles.com/ugd/b4609a_c4faa9bc2e4540ce9438e30c5f0a5d73.pdf
    • https://static.usrfiles.com/ugd/ce4b7c_f8b70f1d4f9f48a999bfea781b321cbe.pdf
    • https://static.usrfiles.com/ugd/4dbf3f_89699251ee4b46cda863e458e71c94cf.pdf
    • https://static.usrfiles.com/ugd/c1c462_c854f15cc5114d758a596b89417b886b.pdf
    • https://static.usrfiles.com/ugd/a8cc01_84cc7536c1034eda9b2e54dda0ab0701.pdf
    • https://static.usrfiles.com/ugd/16879a_297d713e7a4840959a2f24d3a114809d.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_off000040b1.bin
09beb66035b9bb91f7cddba3098114d57f4b886ae4374028e5865ee04b267a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40B1 5184 bytes
font_01_sfnt_off00005277.bin
ac85350e4736717b4c3c7ddde2559b7b9fecb43d38ccce4466a89844d1328f6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5277 9800 bytes

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