Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d865bdd218ba84f…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 09:58:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ef8a8bb5a21eb513de8492b2466af807 SHA-1: 8c019095d9a50f479480301370b6d0fcc79e5114 SHA-256: 5d865bdd218ba84f29ba5627a2d51d1b3b3b43d27897b4716a5fe9e0a11fb8d5
260 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links, specifically targeting 'game hacks' and 'free generators'. The document contains numerous links to external PDFs, many of which appear to be SEO-optimized lures for popular games and platforms. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, suggesting a multi-stage redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • 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.
  • 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.online/app/431946152/op-rewards-robux-game-hack In PDF document text
    • http://tasleemdubai.com/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://tasleemdubai.com/userfiles/files/minecraft-toolbox-premium-apk_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_off0000505b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x505B 25020 bytes
SHA-256: a2cff981c0a98d2ecb5d17b1aa6e7fffbabd8673ed82b7ff4fe4452726232106
font_01_sfnt_off00008a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8F 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9479 18592 bytes
SHA-256: 61fcf6890a53ac437d28a0a1b955c1ae9fc36ec45f89f4a8c20bebee047e4314

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