Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41b45a37e9c0dcc…

MALICIOUS

PDF

33.1 KB Created: 2021-07-19 20:07:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 544e9a42cd2919b5b2f11fd2c633c09a SHA-1: e71e36ae6eea3cf1b8d1226b0e2847f00c681257 SHA-256: a41b45a37e9c0dcc75953b9dbc5f5fbd259b6c6d89bff5282eef51ed12ac656a
180 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The ML classifier strongly flagged this PDF as malicious, and the embedded links suggest a phishing or scam attempt to redirect users to potentially harmful sites. No scripts were extracted, but the document's structure and content indicate it's designed to exploit user interest in free in-game items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.tw/app/406889139/coin-master-hack-game-hack In PDF document text
    • https://magistrinfo.ru/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://magistrinfo.ru/images/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://magistrinfo.ru/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://magistrinfo.ru/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://magistrinfo.ru/images/how-to-hack-roblox-accounts-on-phone_GM431946152.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_002_off00002beb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BEB 23408 bytes
SHA-256: a79ca7971966d848fb6f3166c56ceb1c56e14653f4e788fcc0a3ccbf4ffacbf7
font_01_sfnt_off000060fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60FE 17716 bytes
SHA-256: c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed

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