Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d0019628c1aa94…

MALICIOUS

PDF

38.5 KB Created: 2021-05-10 21:39:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9b1aa5e51c78fb6b6192bba1e96cd39e SHA-1: a3ba25bf6095b431d33aa6e895ba8830ccd0f50c SHA-256: b0d0019628c1aa9481bd36d6e65de7013534679013fd003cd7b3efdca4ea0e67
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack lure, directing users to a known malicious redirector. The embedded URL and document body text reinforce this lure, aiming to trick users into visiting the malicious site. No scripts were extracted, but the primary attack vector is the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • 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.
  • 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/431946152/roblox-hack-site-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_off0000341b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x341B 29296 bytes
SHA-256: 843895e91d509dbc1112f39e23fc5600f898bd4a5d4d02ba30a11cdd18f47f82
font_01_sfnt_off000074c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C7 18408 bytes
SHA-256: baa68e8b80fe17984eb0f5893287011db8c451c65a8bba41303beeb2aadfa952

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