Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e694442dfa7b47a…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 09:55:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d60baf0d9c2992b3a0baefddf0fccc31 SHA-1: 0948a7cea1874d51f7e5eb066df43261f4175847 SHA-256: 8e694442dfa7b47ad1d1107921659314ae6e41183fcd08196f64597354a00589
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on what appear to be game hacks or cheats, leading to a network of redirectors and SEO-optimized PDF files. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spins-cheat-deutsch-game-hack. While no scripts were explicitly extracted, the structure and heuristic firings strongly suggest a malicious redirection workflow intended to lead users to potentially harmful content.

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.tw/app/406889139/coin-master-free-spins-cheat-deutsch-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/swordburst-online-roblox-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-hack-kick_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA3 23060 bytes
SHA-256: 6862f2ffd12023b119a960eb06a5f8258810c227f080274f7dc16625dc86e07e
font_01_sfnt_off0000635b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635B 18648 bytes
SHA-256: 0f75c991103dc95817f01e28baa51d3b59767776a8e5ec3aab022190e4357f66

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