Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec1c7ed875d53bd…

MALICIOUS

PDF

42.6 KB Created: 2021-06-13 20:11:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: df80cbacebae0e6b0e85151d618d3951 SHA-1: 4e940a7421f78fcdccb2bacd50ed42bc9cd5cff1 SHA-256: aec1c7ed875d53bd457d4367107052da510bcade533dbc0f995e58279f38cd2d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors and further lures for game-related cheats and hacks. The document body, though heavily obfuscated, contains references to these lures and the malicious URLs. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/rexima-roblox-cheat-game-hack In PDF document text
    • http://cosver.eu/images/roblox-free-accawt_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/tiktok-free-100-fans_GM835599320.pdfIn PDF document text
    • http://cosver.eu/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/how-to-hack-yourself-on-roblox_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/static-moonactive_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/hacks-roblox-kazok_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://cosver.eu/images/free-name-snipes-roblox-verm_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/roblox-room-cheat-codes_GM431946152.pdfIn PDF document text
    • http://cosver.eu/images/roblox-robux-hack-download-pc-2021_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_003_off00004832.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4832 26080 bytes
SHA-256: 562bd7ebe21483caeb721c6b2f9e107ff1d51be7d6ab8dfe5269c6c05b35e456
font_01_sfnt_off00008310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8310 18660 bytes
SHA-256: fc83b8dcca7767be3ee58617741be6bc1a8d6276569e7fbb1f76ca6e38a4af60

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