Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1eff6a07cfecb6…

MALICIOUS

PDF

36.9 KB Created: 2021-05-19 00:33:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6ca3c1d864731adb579d606ffc59cf3f SHA-1: e3f150e9b9e9caaaff05fb0defedd4850397b128 SHA-256: 5e1eff6a07cfecb634df8595d143cbf5675e6d40299dc701d920b1aeb412d824
138 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as a 'Pubg Uc Hilesi' (PUBG UC Hack) generator. The document body also contains phrases like 'CLICK HERE TO ACCESS PUBG GENERATOR' and 'account will be terminated', indicating a lure to trick users into clicking the malicious link. The heuristics confirm the presence of malicious redirector links and a game hack lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://netcdn.xyz/app/1330123889/pubg-uc-hilesi-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00002e9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E9C 28136 bytes
SHA-256: cffe775619fcc6556712a091f8aedc575a06a4e5fee313250930203d9a0cb6ea
font_01_sfnt_off00006fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 18092 bytes
SHA-256: fc4c191932d800d842714d36e6c60540d8d63251411344aa7d49a0f0df7b87dd

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