Malicious PDF — malware analysis report

Static analysis result for SHA-256 4983f3f21e4f5a47…

MALICIOUS

PDF

45.0 KB Created: 2021-06-09 12:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18741feff7bc062bf4f9ef627acfe58a SHA-1: 0880b92768eb05fb19a7a22a6906bb67981ad958 SHA-256: 4983f3f21e4f5a47d2aa166d64bf92469c9229b0ed682e89dd93b6240de3d5fe
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to websites offering game hacks and free in-game currency, a common lure for phishing or malware distribution. The heuristic firings indicate this PDF is part of a link farm designed to attract users searching for such cheats. While no scripts were directly extracted, the document's structure and embedded URLs strongly suggest it's a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/how-to-get-free-robux-using-cmd-game-hack PDF link annotation
    • http://mycookingpot.com/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/xray-hack_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://mycookingpot.com/images/roblox-vehicle-simulator-free-gamepass_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/passengers-in-free-roam-in-flight-simulator-roblox-wiki_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://mycookingpot.com/images/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://mycookingpot.com/images/roblox-hack-ga_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_off000050ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50EA 24816 bytes
SHA-256: ac82e948434e0782ba5145873f771cb005e9615dceefd685ee80512fbd9bd7bc
font_01_sfnt_off00008a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A41 19312 bytes
SHA-256: e3ca3765af2850c6157031df145807d046f6a854ae521b6f9d471c61a0ce72fc

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