Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd4e3ea61c33131…

MALICIOUS

PDF

35.8 KB Created: 2021-06-29 16:38:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6a8b279b83187d5fe910b1cac86c52b2 SHA-1: 110dc84b3f4917cb2cd032d7e93b0ed1d4c36833 SHA-256: 1bd4e3ea61c331316ff7b27663003e6f4be38804135fd59915d5a3d171a32a11
220 Risk Score

Malware Insights

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

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. The primary link redirects to infrastructure known for malicious activity, and the document body itself contains a large number of SEO-optimized links pointing to various game-related cheat sites. The presence of these links and the ML classification strongly indicate a malicious intent to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.co/app/431946152/how-to-hack-sword-fight-on-the-heights-on-roblox-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-april-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-beach-simulator-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-alts_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/best-free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-gift-card-codes-list-2021-updated-weekly_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/i-will-hack-everyone-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-using-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/codes-for-roblox-weight-lifting-simulator-3-hack_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-get-1-million-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-100-free-robux-on-roblox_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_002_off0000326a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326A 22844 bytes
SHA-256: a97be722eb27dee65c1d3dc69f9b5e364d56cc8c1e69761415cbda32deedc8af
font_01_sfnt_off000065ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65AE 19548 bytes
SHA-256: 87633aa5cb7d77ead811a47c01d0d878a1d88054aaa3ae921388c1eb3f56c374

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