Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a36e8691733547…

MALICIOUS

PDF

33.6 KB Created: 2021-07-07 08:55:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 261b182626f5dda8dc5123b8f22a2191 SHA-1: e3df341bd549adf5a5dd0e47ebecd6c7f36911c3 SHA-256: 38a36e86917335472c55d65cbc5fe20857eacb49f2ac7eb4be3087b10fd27774
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a malicious domain, likely as part of a phishing or scam campaign. The document body text and heuristics indicate a lure for 'free Robux' or game hacks, which is a common social engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-please-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-in-roblox-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-for-free_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
font_00_sfnt_off00002d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D4B 22156 bytes
SHA-256: 00ed29bdba2f1a75b513d4ab8927e045bfe15441622987995d1b0d2ed8a2e995
font_01_sfnt_off00005e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 18944 bytes
SHA-256: febdc7d9b58a8f5ce5dc5375b2c9cd11fa7fa1fbf09dd55f49548e64a33317d8

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