Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaff4fec135cf975…

MALICIOUS

PDF

49.6 KB Created: 2021-06-11 04:45:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 80d320bdfcb219f7a5ee925bae6ad5f3 SHA-1: 499dacb0e4ef0b426367e04ecaabe611d9933b7f SHA-256: eaff4fec135cf975d65100460087d9518fe38bf3473cf316bacbeb4a6729bf64
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator" or "game hack" lures. The document body and heuristics indicate a fake CAPTCHA or human verification prompt is displayed to trick users into interacting with these links. The primary link leads to a site offering a "robux hack app download", which is a common lure for phishing and malware distribution.

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/robux-hack-app-download-game-hack In PDF document text
    • http://windhorsetrek.com/userfiles/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.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_off000054d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D7 25968 bytes
SHA-256: 684b5c56443aff5283b2d86682f22400845c7aa4dbce9d888a99a2a07c8e975c
font_01_sfnt_off00009191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9191 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00009cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CBB 19004 bytes
SHA-256: dc340f5884f338fa30221ddb35476ff4d906c01a7ad24218c0aba96edb95ee48

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