Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac466748b441f378…

MALICIOUS

PDF

47.5 KB Created: 2021-05-30 07:21:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 946b693c000813fbe2622fa517f79964 SHA-1: 2ca7791febb58dce7e3092ebf33c0b63fe142df5 SHA-256: ac466748b441f378e7b8a2024c565ed72a6205e850e2c9cbcf93169234088929
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for 'free generator / game hack' content, which is a common tactic for phishing or distributing malware. The presence of a large number of external PDF links suggests a link farm designed to improve SEO for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9418

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/431946152/free-robux-without-human-verification-2021-game-hack In PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-tiktok-app_GM835599320.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://ilya.ro/wp-content/uploads/fsqm-files/minecraft-pe-free-download_GM479516143.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_off0000536d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536D 27808 bytes
SHA-256: bec9f5beaf1556728d6e98cb0c3de8525fb9c324a8f341c3787c96724a2155d8
font_01_sfnt_off0000930f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x930F 19624 bytes
SHA-256: 5c907f8fc0171ac382cbe47737dfe307495a07ea2f2097b2a41ed37680731fb3

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