Malicious PDF — malware analysis report

Static analysis result for SHA-256 f401a1025130ff6a…

MALICIOUS

PDF

32.6 KB Created: 2020-04-20 14:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5fbca7d19cb99f58a5a5d2ee3256e14 SHA-1: dcdc81cc619bcee41a6a441343af6692c65c737b SHA-256: f401a1025130ff6a203560c4af857c432a0baf39490fb2ba1104f6d381a7d202
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, many of which are numerically or generically named, indicative of a link farm or SEO spam campaign. The document body, though partially corrupted, suggests a lure related to an 'IMF Liberia country report'. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to a network of suspicious websites.

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://ttthardstyle.com/uploads/1/3/0/7/130776257/130776257.html#imf+liberia+country+report
    • http://newenglandgoodlife.net/uploads/1/3/0/7/130739652/6531725.pdf
    • http://smallbusinessadviceweek.com/uploads/1/3/0/8/130813658/puvadunolixef.pdf
    • http://melancholymail.com/uploads/1/3/0/5/130542924/8557140.pdf
    • http://alexwoodsoutdoors.com/uploads/1/3/1/3/131383515/532424f23c77.pdf
    • http://mikeleespeaker.com/uploads/1/3/1/3/131398059/3123592.pdf
    • http://wellnessthruadventure.com/uploads/1/3/0/7/130739538/f8dfd83646722f.pdf
    • http://apexcareservices.org/uploads/1/3/0/3/130379627/e66289719ce8c.pdf
    • http://hunterstadiums.com/uploads/1/3/0/7/130740259/8473240.pdf
    • http://perrylogisticsgroup.com/uploads/1/3/0/6/130620958/tidubig.pdf
    • http://elizabeth-snow.com/uploads/1/3/0/4/130476672/5702c8.pdf
    • http://cedarhurst.biz/uploads/1/3/1/0/131070207/paguwenof.pdf
    • http://mail.harrisbuilds.com/uploads/1/3/0/5/130589230/98f8adb7.pdf
    • http://knkiapp.com/uploads/1/3/0/2/130289551/7429619.pdf
    • http://monroecountydems.org/uploads/1/3/0/2/130289630/7984755.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_off000059ed.bin
56580dc309841e7385edc7da9ea66478e9b4200c2e772432676c4d79c3504c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59ED 7200 bytes

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