Malicious PDF — malware analysis report

Static analysis result for SHA-256 235a6cfaeed206f5…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 11:29:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: db592d2a8c507ee552f4b85704b92af1 SHA-1: 33921cf6c8cfac1941e7ad7380ed18d9c494e48e SHA-256: 235a6cfaeed206f57d8644f2c4a4ade1fdc598fe469475f485de0a1790aef4ac
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are disguised as game hacks or generators for popular mobile games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a tactic to drive traffic to potentially malicious or scam-related sites. The ML classifier also strongly flagged this PDF as malicious.

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/406889139/how-to-get-free-spins-on-coin-master-iphone-game-hack PDF link annotation
    • http://lib.stimykpn.ac.id/repository/watch-ads-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-noclip-hack-download-ipad_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-gift-card-codes-march-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-hacks-client_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-no-hacking-account_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-birthday-card-printable_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-the-with-downloading-apps_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/cheat-engine-roblox-lumber-tycoon-2_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-zone_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spin-and-coins-links-home_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-do-you-get-free-robux_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
stream_002_off00003151.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3151 23552 bytes
SHA-256: 9a6a1f92947be4283ccd2fb3c7bf96420675fe741659d5f88d594d75493e6d55
font_01_sfnt_off0000667f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667F 18504 bytes
SHA-256: fb94ba828be114796ce33ae88e534852be4d565d50d53dd599267a6729c84c7e

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