Malicious PDF — malware analysis report

Static analysis result for SHA-256 8523cea1e99487bf…

MALICIOUS

PDF

27.2 KB Created: 2021-07-05 12:23:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2f85248291971eeb64deb2b43dcb2e58 SHA-1: 34728601be01b36073b1f51310ca1f5b8d1259a4 SHA-256: 8523cea1e99487bf6f25c82821d50bafd4346a88315082790223972e0ab9d3ee
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'game hack generator' and directs users to a known malicious redirector URL. This suggests a phishing or scam attempt designed to lead the user to potentially malicious content or further compromise. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0328

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/how-to-get-free-cards-sets-for-coin-master-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_off000017d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D2 22140 bytes
SHA-256: a68b6c35939b3059c074919d53f5cea7f40b1eca30f5a864802947c7d6ac337a
font_01_sfnt_off000048e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48E9 18336 bytes
SHA-256: 62ea76718c89f31a7c4f45c7431c072c385949a102d4bb066ded9903bb79e822

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