Malicious PDF — malware analysis report

Static analysis result for SHA-256 f266156dd3ee78ff…

MALICIOUS

PDF

33.7 KB Created: 2021-07-19 05:06:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 71101f9a6299706f6cd92e23b42fcdd2 SHA-1: 7a0461d4211fd9dfa705fc15a6659f63db3ec008 SHA-256: f266156dd3ee78ff210791e623b668db6788d4b76ad15a457f4a168a75b83f74
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 trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or exploits. The document's structure and embedded links suggest an attempt to deliver a second-stage payload or redirect users to phishing or scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://netcdn.tw/app/835599320/free-tiktok-views-no-verification-game-hack In PDF document text
    • http://www.imwd.it/images/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.imwd.it/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://www.imwd.it/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://www.imwd.it/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://www.imwd.it/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://www.imwd.it/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.imwd.it/images/buy-robux-free_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
font_00_sfnt_off00002f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F05 22904 bytes
SHA-256: 5611a9ed2a265ad3ab6f14967e9361c91d33dcedab4aa4f5b8a84eb05d9a6d6e
font_01_sfnt_off0000628b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628B 17984 bytes
SHA-256: 9795b21d017140d10c0b41d7b2b96a83a6c965cfa279b8aa3b98cbcfef695b0e

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