Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ad5d968bc33d6d…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 02:38:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d18baccc64597708db72f3e08d20e524 SHA-1: 0f5af9c274dc2a65955d3d3d75d2d7624a407157 SHA-256: d4ad5d968bc33d6d3c3f27de28684c177e9445e93ca3f950386ecd22c7594145
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, indicating a link farm. The primary lure is related to game hacks, specifically for Roblox, directing users to a suspicious URL. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure reinforces the malicious intent.

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/431946152/mobihack-roblox-hack-game-hack PDF link annotation
    • http://ecoleduchat-grenoble.fr/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-spins-link-blogspot-april-2021_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/coin-master-free-spin-now_GM406889139.pdfIn PDF document text
    • http://ecoleduchat-grenoble.fr/images/how-do-i-get-free-robux-on-roblox_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
stream_003_off00004a68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A68 24616 bytes
SHA-256: f9540c0b7e7dca66df7382b284e1e06696d6ea15158dc4ec6fbfd02523e4db0d
font_01_sfnt_off00008305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 18664 bytes
SHA-256: d288d15c1916950328fb714ac92034fecf93cb41bb8e66b8d5651844f64bc7ec

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