Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bff544853933b04…

MALICIOUS

PDF

35.7 KB Created: 2021-06-29 17:10:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ccd78af7607b32305853a2b6315eb3a4 SHA-1: ab1a04996b7f8fb1e9bd6682a305581e71418361 SHA-256: 2bff544853933b0457f52e7bee5796b76dbe91349c87770751429d3cafc1e9b5
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free generators' for popular games. The document body and embedded URLs strongly suggest a lure to trick users into visiting malicious sites, likely to download further malware or engage in credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.co/app/431946152/hack-roblox-lumber-tycoon-2-game-hack In PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/tiktok-fame-free_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/assassin-roblox-free-exotic_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/blox-rewards_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/jailbreak-cheats-roblox-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/jailbreak-roblox-hack-speed_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/a-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-doge-head-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-202120210-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/play-minecraft-online-free_GM479516143.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_off000031af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AF 23072 bytes
SHA-256: 7f8cb9c5894eb02c3c6bd1ede8fb2421fd9f07ba8a747b3279fe60b142f88ceb
font_01_sfnt_off0000655a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655A 19360 bytes
SHA-256: b0dc6947241785cd313d808aadf448cf648360d3608ec8cd6b3550a04c4ee887

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