Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad224bf637aa739…

MALICIOUS

PDF

44.6 KB Created: 2021-06-10 22:52:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d45eec6a589093704a574e077182329c SHA-1: 0fdaea9f9614cec6aeb72e35e4d37a22e9712cc0 SHA-256: 1ad224bf637aa739118b83bf4a190b593cdb4ba7f44bc18201bd2fc07c8e341a
240 Risk Score

Malware Insights

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

The PDF document impersonates Facebook and uses a fake CAPTCHA lure to trick users into clicking a malicious link. This link redirects to a known malicious infrastructure, likely to download and execute a second-stage payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/hacking-roblox-items-game-hack.
  • 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/hacking-roblox-items-game-hack In PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/pubg-uc-20_GM1330123889.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coins-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/abd-roblox_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/como-hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/can-you-get-minecraft-for-free-on-pc_GM479516143.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
font_00_sfnt_off00004fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA5 25936 bytes
SHA-256: 70ca586fe309417608928f8349cd073d8f81fcc6825c8a1d98189c11d4d405f7
font_01_sfnt_off00008970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8970 18956 bytes
SHA-256: 46aeb179e3f8771da2e9d98f22ae95d6dcc7d4b84e1e8718934e47ce7a65640f

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