Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3b96cf4371f84…

MALICIOUS

PDF

61.9 KB Created: 2020-03-25 13:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11a5a30f76212a2a76ea915e5b5b46f6 SHA-1: 6087bed2797a1df24843cb91ca7fd72ed090de0b SHA-256: cff3b96cf4371f84aa44564360e5d91717bdd0b5de6a51f8e47120be27e00e9c
94 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a 'link farm' by heuristics. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to various domains, suggesting a distribution network for malicious content. The document body text is largely unreadable due to encoding issues, but the presence of the URL itself indicates the likely intent is to redirect the user to a potentially harmful site.

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://vandermadetransport.nl/uploads/1/3/0/7/130775362/130775362.html#concepto+y+caracteristicas+de+la+administracion+publica
    • http://akronglobal.net/uploads/1/3/0/3/130380084/sajejofujosufe.pdf
    • http://cancunstanduppaddle.com/uploads/1/3/0/6/130604307/tiletexefuj.pdf
    • http://masterchos-ata.com/uploads/1/3/1/0/131070579/fukoba-wufagojajes.pdf
    • http://preapprovalcredit.com/uploads/1/3/0/7/130776490/fijiwapimaj.pdf
    • http://rachelleffel.com/uploads/1/3/0/7/130739856/5424791.pdf
    • http://www.splendorosa.com/uploads/1/3/0/5/130540049/dizosevuvagotopeb.pdf
    • http://morganhoeft.com/uploads/1/3/0/3/130379060/gejaju-gemuragorod-xazixudesu.pdf
    • http://brownwoodhealthdepartment.com/uploads/1/3/0/2/130289236/ximafebosalev-pulajozikon-lixinojok-kotanexug.pdf
    • http://youarenotaloneart.com/uploads/1/3/0/7/130740053/xenuzidawoluzetew.pdf
    • http://mx.talbotspecialriders.org/uploads/1/3/0/6/130620612/ec832055d8f.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_off0000c7f9.bin
49177c4edb0e69be3a0277ef2bb823170e4417e1ddb5cb7daee38c1e35a40000		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 9096 bytes

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