Malicious PDF — malware analysis report

Static analysis result for SHA-256 424ef73834f2b2a7…

MALICIOUS

PDF

47.1 KB Created: 2021-05-10 11:35:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fcc704f9aba4b40160c3f4e900c056d1 SHA-1: d5d1f4e0260ee5b43e811ae1dcc1661d9bd727f9 SHA-256: 424ef73834f2b2a7bc67abd9e1cd8ad81178acbec4704f0dd54d0d52e5910a3a
170 Risk Score

Malware Insights

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

The PDF file contains multiple links to known malicious redirector infrastructure, specifically masquerading as a 'free Minecraft thumbnails' generator or 'game hack'. The presence of a remote support lure heuristic suggests a potential pretext for further compromise. While no scripts were directly extracted, the PDF structure and embedded links strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0123

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/479516143/free-minecraft-thumbnails-game-hack In PDF document text
    • http://www.freenom.comHeyIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003604.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3604 25352 bytes
SHA-256: 8cc94a676c5afd4c444fc9db309e42285b858f6b28fd43f507d211b0b06415ab
font_01_sfnt_off00006f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1D 7936 bytes
SHA-256: 218d53b68bdddb064f6fba4be822d5b3725ed1cef1a3b42796a8dd99c4a62f4e
font_02_sfnt_off00008846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8846 4232 bytes
SHA-256: ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5
font_03_sfnt_off000096d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96D2 18368 bytes
SHA-256: 85a02e6fcaecceb391bd1a2e9ef36225352b9e1f533fa420e6bae34b60a7da86

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