Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d55a3c39ee4bf02…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 19:35:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a58762e0ea418b8530d89e1b6e82b6c6 SHA-1: 8c9a2a3fc3eddf504c4715d23750154655e22faf SHA-256: 5d55a3c39ee4bf028d1e9902b86d9a948701a9682d7ecbf89874e0b77a4d0f4d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as generators for game currency or hacks, such as 'free-400-spins-coin-master-game-hack'. These links point to known malicious redirector infrastructure and a large number of other PDF files hosted on a link farm. The document body and heuristics indicate a lure for potentially unwanted or malicious content, likely a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/406889139/free-400-spins-coin-master-game-hack In PDF document text
    • http://montchanintt.fr/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/easy-robux_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://montchanintt.fr/images/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://montchanintt.fr/images/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://montchanintt.fr/images/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://montchanintt.fr/images/roblox-gang_GM431946152.pdfIn PDF document text
    • http://montchanintt.fr/images/how-can-you-get-robux_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_off00004902.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4902 28240 bytes
SHA-256: 753c53d9734ade8a2d8e3f06ee0c4b7a5fb94273735d600900cf2ac82bd670d2
font_01_sfnt_off000086cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86CB 18120 bytes
SHA-256: 83d73b5d15900ebf4c8e8e4c37772eeea58eeced4667d8a4ec0d9f93b93c7b15

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