Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c34eb0e7bf20b42…

MALICIOUS

PDF

48.8 KB Created: 2021-06-08 21:55:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2470fe80c2f8fb2f729032b48975027f SHA-1: 5bd510500582d3a9ca7fefbea6e5cd034ecc717a SHA-256: 5c34eb0e7bf20b42277a8c0ccca6a33e23ec9c5808b9f65b3b9fa7e66b8078c9
200 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a game hack generator, which is a common lure for phishing or malware distribution. The document also displays a fake CAPTCHA to trick users into interacting with the malicious link. While no scripts were directly extracted, the presence of a malicious redirector and the fake CAPTCHA strongly suggest an attempt to deliver a second-stage payload, likely via a drive-by download or a further phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/jump-faster-in-roblox-hack-game-hack In PDF document text
    • http://learningarabic.co.uk/images/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://learningarabic.co.uk/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-com-games-referrer-roblox-player_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-obey-roblox_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://learningarabic.co.uk/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://learningarabic.co.uk/images/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://learningarabic.co.uk/images/mcpe-optifine_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fb5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB5 25112 bytes
SHA-256: 09bee3858d00e853176e7274bb787496b6f1ee463b491813742766946f0e0b99
font_01_sfnt_off00008900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8900 6768 bytes
SHA-256: fa93de321190668b294ff46149e4b98ac349b4fd022dcee9ecd964f7f59f3f9a
font_02_sfnt_off0000993f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993F 19192 bytes
SHA-256: 2ec7e07eddcb945550688f5dc6d7f41a14bbd07db5aa2073f1a9c416fd71b657

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