Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaf2902857217e5…

MALICIOUS

PDF

41.6 KB Created: 2021-05-15 04:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c144934596acb31a589b4b324aa613bb SHA-1: ccb707875447423be8bbe6345b93536482cd8ee9 SHA-256: acaf2902857217e571fcf5f2cea06155cb0021a4d5c7451df91283eefb82cc64
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 0.9971

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.xyz/app/406889139/free-spins-for-coin-master-2021-game-hack PDF link annotation
    • http://lawpatron.ru/images/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-mod-version-free-download_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://lawpatron.ru/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lawpatron.ru/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-hack-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lawpatron.ru/images/coin-master-jackpot-madness-hack_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_003_off00004886.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4886 24324 bytes
SHA-256: 3e5c4e3abf23d6d0f11df32d5290809ac95860d78150385eb8af779b272ee894
font_01_sfnt_off00008037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8037 18288 bytes
SHA-256: 66febbde5b4b2b6a44609229e8681f3f0581fff3ed5f82ed8e3d83342858c217