Malicious PDF — malware analysis report

Static analysis result for SHA-256 6668550fc3e235af…

MALICIOUS

PDF

39.1 KB Created: 2020-04-16 05:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7c53fa1aa470b2d534957a0f02cc48f7 SHA-1: 2d2b3f0e182b160fd6d9b80110db44a8f285d5f6 SHA-256: 6668550fc3e235afb7c4fc7a61a65fca06a5cd44fbe704d90b9decb085cd7db8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leadernelsettore.com/uploads/1/3/1/6/131606494/131606494.html#fb+camera+effects+platform
    • http://theballoonbarnj.com/uploads/1/3/0/4/130488357/c4332c389b8.pdf
    • http://rocktrainer.app/uploads/1/3/0/3/130323213/1477933.pdf
    • http://dominikschuster.com/uploads/1/3/0/8/130813786/witavasamo-kisuxug-sexuvukuk.pdf
    • http://sconniehealthandsurvival.com/uploads/1/3/1/1/131163783/45fcdc4f.pdf
    • http://hippypalooza.com/uploads/1/3/0/5/130539078/7273192.pdf
    • http://lookingforparadisetravel.com/uploads/1/3/0/8/130815093/vidimobaro-vetuki-xikasekolelata-sukedede.pdf
    • http://shanszs.com/uploads/1/3/1/6/131636698/vovivabovemosugogiru.pdf
    • http://trumpstickers.net/uploads/1/3/0/2/130289776/bizawivulavig.pdf
    • http://xunpengwu.com/uploads/1/3/0/6/130639404/dabebunafew.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_off00006ed3.bin
8dc5c369378948ce6ce0d9818335e9403884c1f476ec374ff701c6d5de8f8fb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED3 8972 bytes

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