Malicious PDF — malware analysis report

Static analysis result for SHA-256 f964f95fb610b1e4…

MALICIOUS

PDF

48.1 KB Created: 2021-06-04 00:54:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0ddb4752086ddc4046fb7f5712e38b4d SHA-1: f0f72f4a168a694271f1d66ffebc2e96a1315019 SHA-256: f964f95fb610b1e4bd72ffc785ad12a5cc6df5fd5090ae3b7c190d36a8ba6bd0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and free spins, identified as a lure for malicious activity. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The document body, though truncated, contains a URL that aligns with these findings. No scripts were extracted, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-free-spins-link-today-facebook-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/wurst-115_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/can-tiktok-free-view-bot_GM835599320.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/get-free-spins-coin-master_GM406889139.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_off00005652.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5652 24360 bytes
SHA-256: 72d28e8ab9cd4dce44b5872c5e0c1f095f8ea1a8cecd7ede60bcec10a82413a7
font_01_sfnt_off00008e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E10 2920 bytes
SHA-256: 64c53edae7920bc04119553d13e7f88c7ab8c9d6abd0f5e62be35afdb33f76ff
font_02_sfnt_off0000982c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x982C 18568 bytes
SHA-256: 976bad0f84eadf36fe6397f68da5c043a767fda9c526d6325df07f5c92c7ef85

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