Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff25a5c8a823422…

MALICIOUS

PDF

39.0 KB Created: 2021-05-22 17:06:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 67ba0073ec390cfe58930f8dfe985251 SHA-1: 0b07666205d7eaab0b18068414b29c73d86b3418 SHA-256: 6ff25a5c8a823422c99c2d9b8ebbb53488154e1485dcc297130b602e251dad0c
200 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically a site offering 'free TikTok likes' and other game-related hacks. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with these links. The ML classifier also flagged this PDF as malicious, supporting the assessment of a malicious redirector lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/835599320/free-tiktok-likes-no-human-verification-or-downloading-apps-game-hack In PDF document text
    • http://baah.ca/images/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://baah.ca/images/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://baah.ca/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://baah.ca/images/robux-hack-me_GM431946152.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_002_off0000320a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320A 24320 bytes
SHA-256: e9d6cae0db479245bea624cb1cdca5dda1b32d06fa38fce6611803f3935151c8
font_01_sfnt_off000069d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69D2 2912 bytes
SHA-256: 02b35010e2614e3cc95ac6414c49295350c91fdfcc4b4cad27ffdbc10e80df7f
font_02_sfnt_off000073ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73CE 19260 bytes
SHA-256: 26817b4cedfa85687dbcd5cd5fe0b6768af480ef1d18351329c732120202e544

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