Malicious PDF — malware analysis report

Static analysis result for SHA-256 be32159c41db85ea…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 06:20:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 28865cb3763070d0b3674bb6a5760ee3 SHA-1: 5a11e0f1e45ba132e4f03c8dd42c2cf5e8f0ff05 SHA-256: be32159c41db85ead551b3de223522fbeb32325b16d1e5780f143815a548455a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a redirector service that masquerades as a game hack generator. The primary malicious URL is https://netcdn.online/app/406889139/free-coins-coin-master-today-game-hack, which is likely used to deliver a second-stage payload. The document body and heuristics indicate a lure for free game items, a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-coins-coin-master-today-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-chest-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000518d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518D 25216 bytes
SHA-256: 608b1eb13b9751ec591e9a24809642e468e310562658734cf1f57d22fa76354d
font_01_sfnt_off00008b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B4E 2824 bytes
SHA-256: a0d6c1ef1f7405ab05245801e4abbc2877925f97898db53811df9ab010e978fa
font_02_sfnt_off000094ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EC 18064 bytes
SHA-256: 85a7a6543eb7f59a149e6876aabd32521cb1fc93bcbc39754761d1a657ff29d4

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