Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bfc1de57891efe…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 18:42:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c40c3e97e294b41723a78637d3ebac1a SHA-1: 2349f876134f5860ca1873eb026ebd075daf6c8b SHA-256: 61bfc1de57891efe92f4c5685fc5363f662d3b987c325ccec5e522feaac2fbff
160 Risk Score

Malware Insights

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

This PDF document employs a game hack lure to trick users into clicking links. The primary link directs to a known malicious redirector infrastructure, which in turn hosts numerous other PDFs with similar lures. The document's structure and embedded links strongly suggest it is part of a phishing campaign designed to lead users to potentially malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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-reward-link-game-hack In PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-2k-hacks_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/aimbot-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-cheat-engine-speed-hack-mac_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/easy-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-free-without-sign-in-also-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-free-stuff-in-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-free-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/h-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-minecraft-gift-card_GM479516143.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_off00002f86.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F86 22884 bytes
SHA-256: 95412fd712f29ece9edd4998be2987378acbe12dc5655704d837730808b47bd0
font_01_sfnt_off000062b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 18340 bytes
SHA-256: c1246ab1d9e393b3d89bf1ae428e5235d00f0bb5ef049749243bc3f4df939c9c

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