Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd24a0e7f6fcbbbd…

MALICIOUS

PDF

49.0 KB Created: 2021-06-09 05:29:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c14812a8da5328549518fb899412ff09 SHA-1: 07e54916f5f2e3a5d8bc76562bd523f0ae99cc3b SHA-256: fd24a0e7f6fcbbbddd2143d3313d8a22c491157b7cd9a1e202c05dda536fbbfe
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are disguised as game hacks or free item generators. These links likely serve as a lure to redirect users to malicious sites that could host malware or phishing pages. The presence of a link farm heuristic further supports the malicious intent of distributing numerous potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-free-stuff-for-avatar-game-hack PDF link annotation
    • http://lib.vipklh.ru/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-use-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005167.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5167 24772 bytes
SHA-256: af636be0640ebae45c9ff3ccb6264a0cb674fb5cace5577daa3905990bf4b691
font_01_sfnt_off00008a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7C 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off00009bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BED 18532 bytes
SHA-256: cf7d17cabbc7fbb3a23111edb4e3324cbbeb6d12e333e44842314733fc0f3bb2

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