Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c6007735158f3b…

MALICIOUS

PDF

37.4 KB Created: 2021-05-11 20:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6a12f588953b40ff23741987fbd2fd48 SHA-1: b625604df42952b96dfb41adf2f479ec320d2175 SHA-256: 58c6007735158f3b5723f2295fe12d2ed04decf0186f6c9fb3c6e25283cf6972
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'free generator / game hack'. The embedded URL leads to known malicious infrastructure. The document body, though heavily obfuscated, contains references to the lure and the malicious URL, suggesting an attempt to trick the user into clicking the link. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/431946152/free-roblox-card-game-hack In 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_003_off00003478.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3478 26332 bytes
SHA-256: 65e01b98261e749ecd475b6a51b96a44398e5cc4c6a5a3109e2d898c982bc120
font_01_sfnt_off000070c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C6 18348 bytes
SHA-256: 112d0d0d53092b330ca0b2276e93dcc27866393801cc1956065b4b485469ba66

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