Malicious PDF — malware analysis report

Static analysis result for SHA-256 8790d7173e3d8cec…

MALICIOUS

PDF

39.2 KB Created: 2021-06-07 03:40:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a48cc77266b201364dafa755c27433f7 SHA-1: bef99ad1fd2b4ada54a5c3ee07857dfdf3c76992 SHA-256: 8790d7173e3d8cecbf17089738419f7ef9defbe936e620c20de58af4e399e87a
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 game hack redirect lure, pointing to malicious infrastructure. The embedded URL, 'https://netcdn.tw/app/431946152/roblox-thomas-game-online-free-game-hack', is identified as a known malicious redirector. This suggests the document is designed to trick users into visiting a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0353

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.tw/app/431946152/roblox-thomas-game-online-free-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_004_off00003a83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A83 26344 bytes
SHA-256: 7f68bedc02a15274f742a94a094e3a7c922acd939846414e0adf9d09eb4d32ea
font_01_sfnt_off00007694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7694 18720 bytes
SHA-256: 64ce60e09f417ef0ac67b641ee8c0861a0c5d7ae5e092d6100d3402d31d24f16

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