Malicious PDF — malware analysis report

Static analysis result for SHA-256 a161fb710ebf8abd…

MALICIOUS

PDF

37.2 KB Created: 2021-05-30 03:51:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 32ea2a4a096c352410d1fe991d075b96 SHA-1: ce431dcdce855db809a4b95b210e0fa53158f829 SHA-256: a161fb710ebf8abd8f2f8549e378246c09a8ea9785aeb5ffb1282973c2cc5215
160 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, specifically advertising 'free TikTok coins' and 'game hacks' to entice clicks. One of the primary links, https://netcdn.xyz/app/835599320/free-tiktok-coins-game-hack, is flagged as malicious infrastructure. The document body also contains references to other potentially malicious PDF files hosted on ths-academy.net. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the lure suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8925

Heuristics 4

  • 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.
  • 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-coins-game-hack In PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-toys-for-free_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
stream_002_off00002c66.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C66 32668 bytes
SHA-256: c564ec6e465418f108a383c39daa57b95bef40780290b4af1bd83a64b2b02fa5
font_01_sfnt_off000072eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EB 17456 bytes
SHA-256: af63c3f67091ff5b4163c7a95634870b81efad78e40c2266e63b82bf422718e0

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