Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b613aba10cb77d…

MALICIOUS

PDF

31.0 KB Created: 2021-07-25 17:10:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 561ee7f74fc3d60181ec5e35589ef730 SHA-1: 55a703a81a59b356f9b194f7a8efb4b2ef7cea01 SHA-256: 89b613aba10cb77dcc7d805feed6b5682224646e786146bfc3218d3c05de2f00
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and a call-to-action button designed to trick the user into visiting a malicious redirector. The primary link, http://netcdn.tw/app/406889139/coin-master-free-spins-link-today-game-hack, is associated with known malicious redirector infrastructure and lures users with the promise of game hacks. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0564

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/406889139/coin-master-free-spins-link-today-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_002_off00002243.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2243 23384 bytes
SHA-256: 1fcd8ae2929efa540e48173e7f79808f1bef5c5a16c308a351005d9225fec6dc
font_01_sfnt_off0000575b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x575B 18412 bytes
SHA-256: ee277532c3187caf3da016130e4cbd3fee848ac0b1174d0f40fc16c12ed3c41d

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