Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a2a70e8e49a5b5…

MALICIOUS

PDF

34.1 KB Created: 2021-06-30 06:57:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 446a6159df81ceafb1db394b1d8e482e SHA-1: 3597e1034a5555c8607509350caf487b0137bc05 SHA-256: 21a2a70e8e49a5b580bffd64e7d901a4fce472b4741c631d6a419d979c1a03a3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and embedded text that lure users with promises of free game-related items like Robux or TikTok likes. The primary link, http://netcdn.co/app/431946152/compte-roblox-hacker-game-hack, is identified as a malicious redirector, indicating the document's purpose is to lead users to potentially harmful websites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/compte-roblox-hacker-game-hack In PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/cheat-roblox-jailbreak-2021-money-free_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/best-tricks-co-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/elysian-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/tiktok-free-icon_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/3-roblox-games-that-promise-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/hack-dragon-ball-onliine-revolution-roblox_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-do-u-get-free-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
font_00_sfnt_off00002e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E94 22168 bytes
SHA-256: ec1488d281f8afce7b2f17f16c195b65bf5d7e0eee4f86a8a34669826d8b56d3
font_01_sfnt_off00005fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 19196 bytes
SHA-256: d768470114de8c192a45f8a4ffd43c36e610fab4b56e9508f394d36e441bf300

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