Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd4e9e682dad72d…

MALICIOUS

PDF

227.8 KB Created: 2021-07-07 19:27:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a31e71257be55af98db2d6f6827331fc SHA-1: fe202bd7c46fe88a0d70bf95b40e7c64501b157f SHA-256: ecd4e9e682dad72dbbef0398114632c64d406f97f8cc40e897f1f0c6b1dfe99b
250 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating social engineering lures, including a fake CAPTCHA, a download button, and a browser extension installation prompt. The primary lure is a link to a 'free generator / game hack' which directs to a known malicious redirector infrastructure. This suggests the document is designed to trick users into visiting malicious sites, potentially for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0118

Heuristics 7

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.tw/app/1094591345/pokemon-go-no-free-box-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/como-tener-robux-gratis-sin-hacks-facil-y-rapido-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-ez-points-gg_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-inventary-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-how-to-play-welcome-to-bloxburg-for-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/axe-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/what-games-on-roblox-work-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-de-volar-en-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-roblox-promo-codes-2021-april_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-jordans-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-rc7-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-roblox-gift-card-codes_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_023_off0003237e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3237E 25576 bytes
SHA-256: 0b861c94bbda12ae8df7d0ddf02c3ca40fd574567444c7c52ac9cb43cc55532a
font_01_sfnt_off00035f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35F7C 18784 bytes
SHA-256: 08ad6b312b6bcf8ab54891e95189ccc30ccb98040e552b2101580c45e9bad7ee

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