Malicious PDF — malware analysis report

Static analysis result for SHA-256 f441eaaa2f8c3208…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 09:27:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 133453b84007abd0d09d1d8fd4bd8768 SHA-1: f0d6d9cfbc842ce5c4a1db621231361052d80030 SHA-256: f441eaaa2f8c3208a11db903e00c6d50a4503a5d49eaec0c8cb1febef0f4cb5c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.tw/app/431946152/free-robux-without-downloading-anything-game-hack PDF link annotation
    • https://encounternepal.com/userfiles/files/roblox-rules_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/robux-gift-card-codes-free_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/pastebin-free-robux-hack-no-wait_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/cheats-in-roblox-games_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-websites-that-actually-work_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_off00002f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F66 21340 bytes
SHA-256: 9e543afa7b2888e4fe140c4d77f80859f652d411dfe7edeba5074199e9e44086
font_01_sfnt_off00005e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E1E 20064 bytes
SHA-256: 4b9c18d9a006b22bcf5f0b8ca3ed5b82c179739203e5b30b6354743aff3950b6

Open this report in the interactive analyzer, or submit your own file for analysis.