Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6772df22d13cff…

MALICIOUS

PDF

38.0 KB Created: 2021-05-10 20:06:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00aa70e6f9701a6b9bbe150212311d45 SHA-1: 4f63ae0be32de740add937bc46f17b8f5271c7ce SHA-256: ba6772df22d13cffed2e54c974a86cbec0f3aeeb5ff9d796b0b0eb78c07d2625
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors disguised as "free generator / game hack" lures, specifically mentioning "Coin Master Free Spins Link". The presence of a fake CAPTCHA heuristic indicates a common social engineering tactic to coerce user interaction. The embedded URLs likely lead to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9280

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-free-500-spins-link-game-hack In PDF document text
    • http://vibrato.fr/images/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://vibrato.fr/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://vibrato.fr/images/game-toolbox_GM479516143.pdfIn 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_off0000392b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x392B 25212 bytes
SHA-256: acf8a86fdd74f79cefeede1a2d57161d6cf0a00e4c1e0cc67a019cedeab446ac
font_01_sfnt_off000072d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 18364 bytes
SHA-256: 33230dd31aa748bf1398a8caf159a2e0526d630f4ba3696973c22a4ea98bab65

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