Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef81f89e2f33edb…

MALICIOUS

PDF

46.0 KB Created: 2021-05-13 23:36:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 55eeb29f01c9655d2a3768067507ddcb SHA-1: a6b7ab78ec3d729c95e12f0085a78b3d653f0e09 SHA-256: cef81f89e2f33edba7d0705e523c9f18dcc763ef7bfe3c3bd050e84421b559ec
200 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 deceive users into interacting with malicious links. The primary link directs to a known malicious redirector, which likely serves as a distribution point for further malicious content. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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.xyz/app/431946152/roblox-fly-hack-game-hack In PDF document text
    • http://ansacare.com/images/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://ansacare.com/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://ansacare.com/images/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://ansacare.com/images/get-free-cards-coin-master_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
font_00_sfnt_off00004896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4896 27932 bytes
SHA-256: 77d7195beadc1d6564896d5a1cc1a1d95d0378a7544730d96b689687c6841921
font_01_sfnt_off00008674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8674 2920 bytes
SHA-256: 44788e4cedabc7e030d7cef5410c7f71146b1d44f4d1eb58a5000d3755917c6b
font_02_sfnt_off0000908a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x908A 18528 bytes
SHA-256: 48aa5298b09ebe1486756ea90f1095ff6b224374f32c9ff4b9ed1390be9ca915

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