Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ad891545f3f3e8…

MALICIOUS

PDF

37.7 KB Created: 2020-05-16 21:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f4a6d72d84158ea0f65a81d226c63d5 SHA-1: 5886306ccb131253dd41701c90eb347ec5434055 SHA-256: c0ad891545f3f3e8cfe39bcc8aaeade187e32990ac0e972f3110b8f77dbb9109
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded document body text, though partially corrupted, contains a reference to 'Borderlands 3 classes guide reddit', suggesting a lure to attract user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://rockysmountainpainting.com/uploads/1/3/0/5/130590105/130590105.html#borderlands+3+classes+guide+reddit
    • http://hanleyfraserinc.com/uploads/1/3/1/4/131454549/doninajew_wetomugexemu_werevinekuw.pdf
    • http://iptmlawyers.com/uploads/1/3/0/8/130873917/rakerimulegopelapu.pdf
    • http://answers-tutoring.com/uploads/1/3/0/5/130538956/dozelu.pdf
    • http://ethicallyenchanted.com/uploads/1/3/0/4/130476098/lebazaxe.pdf
    • http://handymanrichmondva.com/uploads/1/3/0/7/130775354/9077235.pdf
    • http://usagaslogs.com/uploads/1/3/0/5/130539897/2716813.pdf
    • http://olympictileworx.com/uploads/1/3/0/4/130477085/mofuzivo.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068d0.bin
da2ceee848aaea6b2e64bc8472f04d8347986ab99cba7bdac7c215513dfa28b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D0 10272 bytes

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