Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8c1c71f3ac00e0…

MALICIOUS

PDF

41.1 KB Created: 2021-05-14 11:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6b2776bdd9c59fb48a4d0b559dc6b6fc SHA-1: 20797fb2a5729162c190123960ac6d4f4c93e54b SHA-256: 9f8c1c71f3ac00e0677d9a547af89d83506a4b489ce9c2461f6fcfa0f65488a7
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a common lure of game hacks and free in-game currency to trick users into clicking malicious links. The document contains numerous links to external PDFs hosted on a suspicious domain, which in turn redirect to a known malicious infrastructure. This suggests a link farm or redirector chain designed to lead users to potentially harmful content or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-hack-2021-download-game-hack In PDF document text
    • http://mohacad.hu/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/e-free-roblox_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://mohacad.hu/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://mohacad.hu/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mohacad.hu/images/free-coin-master-spin-app_GM406889139.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_003_off000045f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45F4 24524 bytes
SHA-256: 0bca7a92ec81ef43a736d4a39798c660d5b5cc419457957d32f8a23a94e8d9fc
font_01_sfnt_off00007c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C90 18696 bytes
SHA-256: 01e33fa384fcd9559826a4aa1de189e20085b3e2fa6b70097625b29721cffd1e

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