Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5a9f34c159acd0…

MALICIOUS

PDF

32.8 KB Created: 2021-07-20 08:13:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a29a488aa3d1e831a8ec9e41c40d16d SHA-1: 0a0733218d1a561d1cdba83c21e3c918b70e6247 SHA-256: 3d5a9f34c159acd00dd4abb6c24fcd172d6542d938a49abd2239370bd5f579d5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, designed to lure users into clicking on what appears to be a free generator or game hack. The document body explicitly mentions 'TIKTOK GENERATOR' and 'CLICK HERE TO ACCESS', reinforcing the social engineering aspect. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/835599320/tiktok-viewer-free-game-hack In PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://www.wrlshipping.com/uploaded_files/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.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_off00002d54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D54 22488 bytes
SHA-256: a77abc4e2dea29b7bd30b8502f5df0ad3fb0937c2d24a8e9a3ee3001fd40a7db
font_01_sfnt_off00005f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 17752 bytes
SHA-256: 03cae80738042903ed7303e5923c2b1ca7393d04b72c6adefe1e53c55c9a8aab

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