Malicious PDF — malware analysis report

Static analysis result for SHA-256 89239aebef363238…

MALICIOUS

PDF

32.9 KB Created: 2021-07-06 01:09:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1fd3ecde1cf8116c9b7c17595dabb5fa SHA-1: 6c1dd6871f8a62fe98931b40f164d4d04e34dbb8 SHA-256: 89239aebef36323821db6dfd101182f7509b8cc9424edaa5533c8a809dc11fbd
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external resources, including a primary redirector URL associated with malicious activity. The document body and heuristics indicate a lure for game-related cheats and hacks, likely a social engineering tactic to lead users to phishing or scam pages. No scripts were extracted, but the extensive link farm suggests a broad campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/cheats-coin-master-free-spins-and-news-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/robux-hack-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hd-admin-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-one-piece-golden-age-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-neon-rideable-pet_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/new-roblox-hack-zombie-rush_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-roblox-admin-commands_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-exploit-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/get-free-robux-now-easy_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_001_off000029e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x29E6 22796 bytes
SHA-256: bbf6c03d74a5304086eaf190aa4a5131078f818920243d72d8a1bdcd75d16534
font_01_sfnt_off00005d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D16 18676 bytes
SHA-256: 187c53b06c05787095bdfe0dcf94dd4e1b2ba58c8389f47ea6da0d26e0945549

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