Malicious PDF — malware analysis report

Static analysis result for SHA-256 9141bc4b621bcfa2…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 20:14:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3eee51878929d56c03789f74d2f3162d SHA-1: 58ebf990c5b57ed09153e52ac48927fecaa38dec SHA-256: 9141bc4b621bcfa276d75e25afe2b6f53b0d974dc2510cd95518cca5292978c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/479516143/free-minecraft-bedrock-server-hosting-game-hack In PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/game-toolbox_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/unlockmygamescom-free-robux_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-b-tools-hack_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-murder-mystery-2-candies-hack_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/campingvip-server-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/best-free-roblox-faces_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/roblox-cheats-online_GM431946152.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://perpusfkip.upstegal.ac.id/repository/free-roblox-clothes-and-hair_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_off00003444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3444 22216 bytes
SHA-256: 68159224638294a13cdda3793b1df8638491c36f54b5bb22ddd2a4d929dc93d6
font_01_sfnt_off00006592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6592 18672 bytes
SHA-256: fcf161d812b4feaa3e2bf8e8c417d8656b3909a46e27a4c0a1d90eda073f6fc6