Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b270cbbd254d4d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 07:27:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d26cef29aa5a8e37065e878956677eea SHA-1: a3c0548b81b3682068369baca17b53107b2621c7 SHA-256: c7b270cbbd254d4d3e417e280007c35b0c7ec04eda201ae30d13b933010b104e
220 Risk Score

Malware Insights

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

This PDF document is designed as a lure, employing tactics to trick users into clicking links related to game hacks and free currency. It contains numerous links to redirectors and link farms, indicating a malicious workflow aimed at driving traffic to potentially harmful sites. The presence of a visual download button further supports the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/robux-get-com-game-hack In PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-legit_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-apk-mod-hack-download_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • http://fourieredu.cz/files/ckfinder/files/how-to-make-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
stream_002_off00002e22.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E22 22732 bytes
SHA-256: 06f1fec71aae639360845b3eb5650eee9c9978588c231e00a41e4c385adab585
font_01_sfnt_off0000611a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x611A 18916 bytes
SHA-256: db1ada3a2550829089172039907c0d31a47922a9106dbd58a0f25c1be09f3418

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