Malicious PDF — malware analysis report

Static analysis result for SHA-256 2167c10ecc7ec37c…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 05:14:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5f45db31c742c994941e77f8a3977c98 SHA-1: 0990dbedf9e172765e64765034c513ca06b2ee67 SHA-256: 2167c10ecc7ec37cb9f9344061b89dc35fc23dcfa173bdeb563f0da8f7ca9da8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game-related items and hacks to entice users. It contains links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-roblox-card-08-15-2021-game-hack, which likely leads to further malicious content or downloads. The ML classifier also strongly indicated maliciousness.

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/free-roblox-card-08-15-2021-game-hack In PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/caught-my-mom-cheating-in-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-robux-hack-computer_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-catalog-roblox-items_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/marshmello-t-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/cool-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-hack-game-guardian_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-not-fake_GM431946152.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_off000030a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30A7 22732 bytes
SHA-256: 31b0602eb3b370685a4666dc806e61ee46d6a84f5d3a4ff76b0b7a658b62ea0e
font_01_sfnt_off0000633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 19572 bytes
SHA-256: 95a11a27d663e1aaabb75c0e617993fb0530d203b7027c813e5816c4c98659ad

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