Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f898320e3f86982…

MALICIOUS

PDF

30.6 KB Created: 2021-07-19 06:50:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 08f493adfbbf9cb87088912f66b36c4a SHA-1: 8c678e4c60d5e21657a9127eba922ea725a83ad6 SHA-256: 3f898320e3f86982b18939d0e2f15674c64e659d802856db4d2a76a35fce45c3
130 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a malicious redirector lure, specifically targeting users with promises of free game hacks or redeem codes. The embedded URL, http://netcdn.tw/app/479516143/minecraft-redeem-code-free-game-hack, is flagged as malicious and part of a redirector chain. While no scripts were directly extracted, the PDF structure and the nature of the lure suggest an attempt to exploit vulnerabilities or trick the user into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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/479516143/minecraft-redeem-code-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
font_00_sfnt_off000024d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D8 22348 bytes
SHA-256: 393111b5b6777d06a644102a492af06be9a2ec7e3a05ab83cd7b2037b8f13071
font_01_sfnt_off0000568f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x568F 18144 bytes
SHA-256: cc19f71067fb84b21b4f81fd44d646587f5653a8a3073e37b17122851b8ee9dd

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