Malicious PDF — malware analysis report

Static analysis result for SHA-256 5149ab39616b1cce…

MALICIOUS

PDF

39.1 KB Created: 2021-05-10 13:18:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 84100c5c617f653bba2c605c596f84f5 SHA-1: 7562afacaca0f65572617a8385302b3f6d244634 SHA-256: 5149ab39616b1cce89ccd41272b4e37f3c369b887e8d0d89746a58e66a894b1c
220 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking a link for a "free generator / game hack". The embedded link directs to known malicious redirector infrastructure, suggesting an attempt to deliver a second-stage payload or phish for credentials. The document's content and heuristics strongly indicate a social engineering attack aimed at user interaction and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • 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
  • 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 https://netcdn.xyz/app/431946152/free-draw-roblox-game-hack In PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://raqam.net/uploaded_files/userfiles/files/how-to-hack-coin-master-game-without-root_GM406889139.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_off00003d72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D72 24744 bytes
SHA-256: 1d238b17719f4aaaf22980e4eff9264a7bfa468931433bbe528ea36580a35c45
font_01_sfnt_off0000763f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x763F 18508 bytes
SHA-256: f910b5e05dc090141321478ad8f2371d3108a4bfaceab19230c4d52c6f4382ac

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