Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2a27fbd1b49f06…

MALICIOUS

PDF

34.8 KB Created: 2021-07-01 21:17:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3cc4e30d3495b31ab831da71cb8ead5a SHA-1: ab64065312af5d708d1928a345492b70e03ff63c SHA-256: cf2a27fbd1b49f0604458e448a9241f9c584652e7b709b5efe08bef4c91e2573
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/how-to-look-like-a-hacker-in-roblox-for-free-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/como-dibujar-en-free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-no-human-verification-100-real_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hacks-for-prison-life_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-admins-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/super-jump-cheat-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-speed-hack-2021-march_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/cheat-codes-for-dungeon-quest-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-avatar-gear_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-all-the-clothes-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/fe2-roblox-gem-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-a-roblox-account-with-nobody-noticing_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-daily-spins-coin-master-2021_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_off000030a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A7 22536 bytes
SHA-256: 770fe8b8764a11d96bcc11ad711f640b0c76507ec17d8cfd393d0f82ee4a1226
font_01_sfnt_off00006317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 19104 bytes
SHA-256: 9f65cd94df2d5f6a4542ae37e76c593dc645c1cc4b63d2d3b7132730689de54d

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