Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2507aacfde246…

MALICIOUS

PDF

37.6 KB Created: 2021-05-14 09:32:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a4e0b6078d1d377a5829acd41a8427b SHA-1: 35a4ec4e3393392b4d4bf84920eb53d87e0bf805 SHA-256: 3af2507aacfde246aa23d0455ad073b19b19c776924d4348e9d28a38a5565346
130 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a lure for a "free generator / game hack" and links to known malicious redirector infrastructure. The embedded content, though partially obfuscated, includes phrases like "Coin Master Fan Page Free Spins" and "CLICK HERE TO ACCESS COIN MASTER GENERATOR", reinforcing the social engineering aspect. The primary IOC is the malicious URL used for redirection.

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/406889139/coin-master-fan-page-free-spins-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_off00003800.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3800 25248 bytes
SHA-256: 3d771c192a3cc38ca0d4c89c3135674ab17fdded564846b3f1ab54ff32c6ef50
font_01_sfnt_off00007181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 18328 bytes
SHA-256: d106028e9c816c4ed38d7f9dbfb4c1b42a2571be69ef627f7b4a635c4c6a8b94