Malicious PDF — malware analysis report

Static analysis result for SHA-256 7332bd2b83ae25d3…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 11:52:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cbef0c9aa1e16d77dc8441b95c3c398d SHA-1: 36f63ea3b87481f66fa457702b70576d8d4ffd30 SHA-256: 7332bd2b83ae25d32d804d4e575275c7f261717f4867c5ed7a0c0bc90fd0cbb6
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-play-any-paid-roblox-game-for-free-game-hack PDF link annotation
    • http://digilib.stie-yppi.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/get-free-robux-from-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/hack-lua-script-for-one-peace-opn-seas-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-make-a-group-in-roblox-2021-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-free-acount-with-rogue-linrsge_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spin-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-stylish-animation-pack-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-connect-to-xo-s-hack-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-how-to-get-in-bloxburg-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-hack-with-cheat-manager_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-beyond-level-hack_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_off00003102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3102 22096 bytes
SHA-256: 0ca92f085cc5fc2c1206f2b37f44739cfe7257377891f0308d25ffcffc9ebcc4
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 19704 bytes
SHA-256: b758275184019f272d4dcd3c4b590985ad750fdd3a5251350151b3eac35a5476

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