Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ad4f75139224f0…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 06:56:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 17aa5a2af2115139ae6099b650ef6beb SHA-1: 7f1f2e20677df24de53c1556acd3c161a46735b0 SHA-256: 22ad4f75139224f005fdddce498790c55febda9b0c1c8f81255cf3d6a2cbdabd
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors and lures users with a fake CAPTCHA, aiming to trick them into downloading potentially malicious files. The primary link directs to a "coin master hack" generator, indicating a scam or malware distribution attempt. No scripts were extracted, but the document structure and embedded URLs strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-hack-version-apk-download-game-hack In PDF document text
    • http://bepquannhu.vn/upload/editor/files/robux-survey_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-online-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://bepquannhu.vn/upload/editor/files/free-robux-no-human-verification-or-survey-2021_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_003_off00004a38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A38 24824 bytes
SHA-256: 30dd58e9953f4310ad3b2451f041e97076633ceb05c5c37620ad64746839967f
font_01_sfnt_off0000838f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x838F 18608 bytes
SHA-256: 1dc11e7f68bd978fc0a92f78b05146ad1c6754ecfa484bd6206fefa9f56aad89

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