Malicious PDF — malware analysis report

Static analysis result for SHA-256 8998d8df77e0786a…

MALICIOUS

PDF

51.5 KB Created: 2021-06-03 12:08:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 058748bd5ed5a592ef379fafcd05d40b SHA-1: 97f34f93381cd62ec7d1b8784d51ec1192d9814b SHA-256: 8998d8df77e0786a508759e011a7e1eca8d048382ef3a6b882dcabed48478070
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO link farms for game-related cheats and currency. The primary lure appears to be 'free Robux' or 'free spins', directing users to potentially malicious or scam-related content. The ML classifier strongly indicated maliciousness, and the PDF structure itself suggests a link farm designed to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://netcdn.online/app/431946152/how-do-you-get-free-robux-without-paying-game-hack PDF link annotation
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/why-pubg-uc-is-expensive_GM1330123889.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/is-tiktok-free-on-iphone_GM835599320.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-ppsunisma.ac.id/repository/hack-coin-master-apk-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
stream_004_off00005090.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5090 37288 bytes
SHA-256: 4bfb6f4956fcd7add23f8e157fb6b7efa92b4f0c9865c6bf54ef543e55d63bed
font_01_sfnt_off0000a261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA261 19948 bytes
SHA-256: 5d1001e3ac77277796354ae1628373f4f4a3ba3fa344903a86c4555bafe1b783

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