Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b5d96f27443de…

MALICIOUS

PDF

48.1 KB Created: 2020-03-27 07:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: de6924dc76cb709f562f2c15cc859f67 SHA-1: 48d21c6a843ee4525a98aabefdff257ab53c60d6 SHA-256: cf4b5d96f27443de68d60b9f32d543e36811166546b0e9666789c4525effe1f1
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm. This suggests the document's primary purpose is to redirect users to a network of other websites, potentially for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://earthpeopleunite.com/uploads/1/3/0/7/130776801/130776801.html#de+re+militari+english
    • http://42hillcrest.com/uploads/1/3/0/6/130604636/7615721.pdf
    • http://thebacchanaliansociety.com/uploads/1/3/0/6/130603803/a3443799.pdf
    • http://www.foundationalself.com/uploads/1/3/0/5/130551567/zojefu-tedixam-davedekita.pdf
    • http://littleedenranch.com/uploads/1/3/0/5/130551362/1c69c54753d5.pdf
    • http://mta-sts.nessebarshop.com/uploads/1/3/0/2/130271113/5487442.pdf
    • http://doublenutmeg.com/uploads/1/3/0/9/130969841/c87d83f6710.pdf
    • http://webmail.lapakumroh.com/uploads/1/3/0/6/130603884/fidilosupizata.pdf
    • http://peaceofhealing.com/uploads/1/3/0/4/130483978/rilataguvowa_jowojitur_gilipo.pdf
    • http://businessrecordsfortodayandtomorrow.com/uploads/1/3/0/4/130488073/diworema.pdf
    • http://discoverzoomingroomin.com/uploads/1/3/0/6/130621455/vilik.pdf
    • http://desertproductions.de/uploads/1/3/0/5/130538950/670327.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_off000092ba.bin
3cc4d804a4356f81526845572219a7c1f16747974be6549f444f04cded0f65f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92BA 8936 bytes

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