Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae32d520a4bd305…

MALICIOUS

PDF

39.2 KB Created: 2020-04-08 16:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb7df492f305052c2b990bb4d8403da0 SHA-1: f7a05fbb1134fe72328d98e4ec1ee2b6b3d7f0aa SHA-256: 8ae32d520a4bd305deb7aad9e2c69fdb48b1af11247fb0d82ac539a51660e16d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body itself appears to be obfuscated or corrupted, but the presence of numerous links suggests a malicious intent, possibly for SEO manipulation or to distribute further malware 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://darkdreammusic.com/uploads/1/3/1/4/131438437/131438437.html#game+of+life+spaceship+gun
    • http://peggyscove.info/uploads/1/3/0/6/130603961/05adfbd6.pdf
    • http://atriumdesignstudios.com/uploads/1/3/1/3/131381721/gapoxasep.pdf
    • http://oklahomacitybulldogclub.org/uploads/1/3/0/3/130323342/maxevadosodatiweri.pdf
    • http://shantireikiyogawellness.com/uploads/1/3/0/7/130775288/6e9096a226f1d88.pdf
    • http://simplypelvichealth.co.uk/uploads/1/3/0/4/130476732/6926071.pdf
    • http://primechairmen.com/uploads/1/3/1/4/131408159/8524788.pdf
    • http://dakotanielsen.com/uploads/1/3/0/4/130435892/7268156.pdf
    • http://gracetaylorstudio.com/uploads/1/3/0/9/130969703/4453295.pdf
    • http://confpapers.com/uploads/1/3/0/4/130483271/f730b494eef.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_off0000668c.bin
09bb217b96ffbee3493ad045610ed7748e89d822feea8068d5fdb04996564ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 8228 bytes
font_01_sfnt_off0000863e.bin
e91619dfd4c72a85464d95ef1ba4e67df13020651c42071bafbe521a61d9f7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863E 2652 bytes

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