Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79cd61b3bc7b669…

MALICIOUS

PDF

44.3 KB Created: 2021-06-13 20:09:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: af4982bb8ffc2f365e301381aec2dbb7 SHA-1: d6691e374f57db1c3029c72968956c65e165aeac SHA-256: b79cd61b3bc7b669164c7c5459f0a56fc62239b3f70c3ef566efeb9a6e861a60
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 0.9980

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/free-roblox-gift-card-giveway-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/secret-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-rewards-2021_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-cards-giveaway_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spin-link-today-download_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/tiktok-free-blue-tick_GM835599320.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/50-free-spins-coin-master_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_off00004aa4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA4 27164 bytes
SHA-256: 9bb02f3c787b078005e335516049a26ef0a4af2cc942a4b922f7ce5ad23453c4
font_01_sfnt_off00008889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8889 19032 bytes
SHA-256: 3895670b1c446a2a757eb9cc6159464994dd0f3ff6809b57f5a0e92666224936

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