Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a4da5f14081821…

MALICIOUS

PDF

54.1 KB Created: 2020-04-16 10:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: db1fe241a4bb62553ccc6e7941f288b9 SHA-1: 17ca5d451dd9138771459f73f3d01cc4a4e3db30 SHA-256: e2a4da5f14081821d0b7a51db7c92619e373cb3fad281b2ef6db4e5622f14837
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files with numeric or generic slugs, indicative of an SEO spam or link farm tactic. The document body, though heavily obfuscated, contains text related to a 'Cube world starter guide' and references to wkhtmltopdf, suggesting a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

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://blackfilmcentre.org/uploads/1/3/0/8/130813732/130813732.html#cube+world+starter+guide
    • http://gtarealestate.forsale/uploads/1/3/1/4/131453154/3d9847c3465.pdf
    • http://folsombulldogfootball.com/uploads/1/3/0/6/130604202/gatevab.pdf
    • http://reshawnullah.com/uploads/1/3/0/7/130776246/gagumikasunurem.pdf
    • http://joejefferson.com/uploads/1/3/0/7/130740497/638db.pdf
    • http://daydreamhairandmore.com/uploads/1/3/0/8/130874362/5947381.pdf
    • http://shipicx.com/uploads/1/3/0/8/130873804/buliwamaxaxijuf.pdf
    • http://drgraefe.com/uploads/1/3/1/4/131482996/2098237.pdf
    • http://higherselfascendancy.com/uploads/1/3/1/4/131453193/totizetubaje_suregitedafan_pinetetad_gawofowinozo.pdf
    • http://saywhatulike.com/uploads/1/3/1/4/131408832/cf6838d0e0909f.pdf
    • http://businessbodytalk.dk/uploads/1/3/0/6/130639747/kedubibo.pdf
    • http://altraver.com/uploads/1/3/0/4/130475990/c2729dab9ff9.pdf
    • http://weldoncreekfarms.com/uploads/1/3/1/4/131453515/33d4d1.pdf
    • http://burmarailway.com/uploads/1/3/0/4/130489410/74e0285088106f.pdf
    • http://moonlumen.net/uploads/1/3/0/7/130739459/boremesugipi-bovexemoxox-zamoroda.pdf
    • http://laketravischeerleading.com/uploads/1/3/0/6/130639407/pixumoluf_lovenuneta_wefuzifot.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_off0000ad3c.bin
08cb07b755322d93fb6d46c4bd85bb64f26846dd6664a077c86d9b5846c5e200		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3C 8040 bytes

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