Malicious PDF — malware analysis report

Static analysis result for SHA-256 64da3820e76c2373…

MALICIOUS

PDF

32.6 KB Created: 2021-07-19 19:32:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cc70262713bbb0ab4a99915d707651bc SHA-1: 1f084b63dce7332c07a0634a511359ef10d34079 SHA-256: 64da3820e76c2373bcab0845b1a5af73bbba45603fc171a1bb8ec4667e636003
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, masquerading as 'free generators' or 'game hacks' to lure users. The ML classifier also flagged this PDF with high confidence. The embedded links likely lead to further malicious content or malware downloads, indicating a phishing or social engineering attack.

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/free-followers-for-tiktok-game-hack In PDF document text
    • http://tc-kulmbach.de/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-hack-into-someones-roblox-account_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_off00002d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D36 22304 bytes
SHA-256: f812df8d19eb9c1421e145fbe08a4dec1fbcffa41676130cdcf6cfb94f5c3438
font_01_sfnt_off00005efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 17692 bytes
SHA-256: 1f78b91f0c2492c05ffeec3d34563e43a0b15f4cc5b4ec219908e79cb2313b3f