Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcde0bf39edd2697…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 07:06:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0d83a73713eb2bde9372a5d6fe06a3e9 SHA-1: 4e3197617cd605c6d707a8e1e855b7f619c55e30 SHA-256: fcde0bf39edd269722464eb63840201a1474dbb5d6551024a749c6b19bafd1f6
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.tw/app/431946152/how-to-get-hacks-on-roblox-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/como-descargar-hacks-para-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cheat-roblox-prison-brak_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-hack-on-roblox-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-you-get-roblox-builders-club-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-hide-and-seek-extreme-hacks_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-candy-script-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-robux-robux-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/cheat-engine-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-work-at-a-pizza-place-manager-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/advanced-battle-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-miner_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/when-will-welcome-to-bloxburg-be-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-free-cards-hack_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
font_00_sfnt_off00002f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F67 22580 bytes
SHA-256: 61779414b3cb0dec99855051fab7dd0c6a1782c6dd56e78c852522bff9ef66aa
font_01_sfnt_off00006177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6177 18924 bytes
SHA-256: 8cdc80fef149013af70ce1ea380cb26237808cf67cdf225847d5804ac9d16e08

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