Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c9436036c2de31…

MALICIOUS

PDF

42.9 KB Created: 2021-05-11 06:31:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6f349cc9252fe8032ee66c9b23047500 SHA-1: b075fe9e65202febaa8a3bdeefd70ea4c77a7350 SHA-256: f3c9436036c2de31c957ac17b680d95bcfad33674aaa2a72cb6f2c92e451b1d2
142 Risk Score

Malware Insights

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

This PDF document employs a common lure of 'free Robux' and 'game hacks' to direct users to external websites. The PDF contains a large number of links to other PDFs hosted on external domains, suggesting a link farm or redirector infrastructure designed to host scam content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/robux-free-gift-card-game-hack PDF link annotation
    • http://opac.kolejkrim.edu.my/repository/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-story-mode-free-download_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-hack-apk-free-download_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-app_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_off000049ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EF 25892 bytes
SHA-256: d8adb3db859b9e8ba729524f222b9244c883b7903af11d014fd3de906f76f501
font_01_sfnt_off00008433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8433 18640 bytes
SHA-256: 299b54e9041e0eacb2b5f4a1a09a85f1fb6c0d753f38c204f1d1c9ff56031a85

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