Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fcc9531af0706c…

MALICIOUS

PDF

34.4 KB Created: 2021-06-27 03:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 525cfe8a00294f44ee570b0544047df8 SHA-1: d6b6f8c5789d7bd3ffc027baeea67a673666344c SHA-256: b1fcc9531af0706c293adc9de666c122e22748be6ed4bf3129090bf98f1d69de
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. 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 5

  • 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.
  • 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.co/app/431946152/cerberus-hack-roblox-game-hack PDF link annotation
    • https://khavarrooy.com/assets/uploads/pages/files/good-hacks-free-roblox_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/gamefreaks-free-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-hack-robux-free-2021_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-how-to-get-groups-for-free-and-make-robux_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-wings-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-giveaway-every-hour_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_off00003149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3149 22100 bytes
SHA-256: 46ee18355c830597cc72106286aa15eb56dacb32c6379856526afbda7b1bc061
font_01_sfnt_off00006233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6233 18796 bytes
SHA-256: d4b3b524d7bced908d6dfc7fad69ebe458d71e8898a164d9149450945426bc5f

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