Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5249dffe808b3a…

MALICIOUS

PDF

44.3 KB Created: 2020-05-20 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f428cba941de4076ceb81d10ab097ea SHA-1: 7588ad2e2aae9934a70ae040621904203e0b873c SHA-256: 5a5249dffe808b3a87f015b1dfd2820546786d1098713f3f0f90d6a1ad89c9e3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to obtaining free in-game items, which is a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://thebrilliantminute.com/uploads/1/3/0/2/130289315/130289315.html#how+to+get+australium+scattergun+for+free+no+download
    • http://ultimatefitnessnm.com/uploads/1/3/1/0/131071315/2fb0d82cf.pdf
    • http://meditationgiftshop.com/uploads/1/3/0/6/130604687/kugokizozigaw.pdf
    • http://mkbdynamicventures.com/uploads/1/3/0/2/130271229/bupason_ziguli_fewerinepixogaf.pdf
    • http://sattvayogaatx.com/uploads/1/3/0/2/130288932/1d538a3fbc9.pdf
    • http://corpdevco.com/uploads/1/3/0/6/130639634/5031727.pdf
    • http://advancedmortgageanalysis.com/uploads/1/3/0/6/130604112/numuw-matez-nunubudidete-tazemubuxifi.pdf
    • http://newstarmultitech.com/uploads/1/3/0/3/130313237/nulisekuva_jorixuma_xixibuwatewefow_liwoku.pdf
    • http://theshabbyduckling.com/uploads/1/3/0/7/130738504/1846310.pdf
    • http://yuanshenghang.com/uploads/1/3/1/4/131406291/6216819.pdf
    • http://virtualconsult.com/uploads/1/3/0/5/130540554/893904.pdf
    • http://alexanderblinkov.ru/uploads/1/3/0/8/130814328/355490.pdf
    • http://saskiarooijakkers.com/uploads/1/3/0/8/130874085/1388107.pdf
    • http://intrepidartistventures.com/uploads/1/3/0/6/130603978/680897.pdf
    • http://sificloud.com/uploads/1/3/0/5/130538862/6741535.pdf
    • http://icaymarketingconsultants.net/uploads/1/3/1/8/131871717/jejewejudinorapuxoka.pdf
    • http://aicontentcafe.com/uploads/1/3/1/4/131406438/7211991.pdf
    • http://marquearchitects.com/uploads/1/3/0/2/130289585/24838b55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa2.bin
f38f9d7d2c6ed806b148b6ccb36ed5eacd65534321cb3851a4bfb5148dfe7b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA2 11184 bytes