Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b3e0745c83b8c0…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 06:12:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f303975f49569411790b0019e8eb0e87 SHA-1: f8be241b1ac881612a9945cfdc426b874a78a7d6 SHA-256: b9b3e0745c83b8c026701a072ad840bd6b1bcd3d9eead8d76b16f932f6f7b483
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a "coin master vip hack". The document body, though partially obfuscated, contains text and URLs consistent with a lure for game-related cheats or hacks. The presence of multiple redirector links and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/coin-master-vip-hack-game-hack In PDF document text
    • http://www.perpusffup.or.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/roblox-download-pc-free_GM431946152.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.perpusffup.or.id/repository/minecraft-hacks-list_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_004_off00005084.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5084 24872 bytes
SHA-256: 707a87c4f2a7672dd670064af96ddd80488a5429dd6d112bafef501dde815d57
font_01_sfnt_off0000897c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 18028 bytes
SHA-256: 3946bb02aaa81310583f7a83aaa835a1d417c23958a40c8f2d44bc67edab2b14

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