Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54c947125caa37b…

MALICIOUS

PDF

33.7 KB Created: 2021-07-01 04:29:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7980545df13383ff5284fff6c6794459 SHA-1: 876154b4552d727ab3a9c86c0c571efb17fa3735 SHA-256: f54c947125caa37bf3db53380bc03ec57e74075b88f97fb449ff3e27b7f4dbc0
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/earn-your-free-rank-roblox-game-hack PDF link annotation
    • http://library.umuslim.ac.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-robux-and-tix-using-inspect-element_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/hacking-2-step-verification-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/get-a-castle-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-horror-tycoon-hack-script_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roblox-account-dispenser_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-hd-admin-commands-script-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/rc7-for-mac-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/robux-hack-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/what-day-does-john-doe-hack-roblox_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_off00002d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D57 22140 bytes
SHA-256: abed8b062df60ab6f6e19e502288b82ca8ffe4497bdfe89ad9c7952fcc6eda8f
font_01_sfnt_off00005e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4C 19120 bytes
SHA-256: 3cc4c48369f1dd1c502a1c19a80bf9ec6bd216980bd148dfe5d9a8d9ad439687

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