Malicious PDF — malware analysis report

Static analysis result for SHA-256 a276809db5ecb7c0…

MALICIOUS

PDF

34.0 KB Created: 2021-07-01 20:08:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 228a6b7b6f2b16ecc5f5c10752f07434 SHA-1: abf060bd618ffed1fda52c75278807f77be05465 SHA-256: a276809db5ecb7c07caf87d1a8a622650ecc895b317e1d7f486c9b56631f2d93
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 free item generators for popular games like Roblox and Coin Master. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the ML classifier strongly indicate malicious intent. These links likely lead to phishing pages, malware downloads, or other scams, aiming to exploit user interest in free in-game items.

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/a-wolf-or-other-roblox-otter-space-cheats-game-hack PDF link annotation
    • http://library.umuslim.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/invisibleble-hack-roblox-wearedevs_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/fake-gps-for-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-money-in-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/6-pack-roblox-shirt-for-free_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-advertisement_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-robux-generators-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-robux-no-inspect-2021_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/roblox-twisted-murderer-hack_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/free-hair-roblox-codes_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-free-robux-without-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/hack-client_GM479516143.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://library.umuslim.ac.id/repository/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umuslim.ac.id//repository/what-games-on-roblox-give-you-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
font_00_sfnt_off00002e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5E 22148 bytes
SHA-256: 2122331be2b4c7040ecf3df7fdaa75b23c881f2475ae67791d7d5b37870d0797
font_01_sfnt_off00005f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 19128 bytes
SHA-256: 42248d6569b833f04519cc8b0290d8ab8d4d815a669cf0d2a6e9e506308d93bc

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