Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eae483ce0fd6c2c…

MALICIOUS

PDF

29.9 KB Created: 2021-07-20 13:50:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ef1efd3b90d53bf7b6623c3997bda411 SHA-1: 0e547c194cce98c1f964a15a98e0d935927774c2 SHA-256: 2eae483ce0fd6c2c99999fd4f68669d754ad698c30a56ab652dbc4e077ee538b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector URL that promises game hacks, indicating a lure for users to download potentially malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game currency or cheats to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

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/431946152/robux-hack-2021-game-hack In PDF document text
    • https://sigal.com.al/wp-content/uploads/fsqm-files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://sigal.com.al/wp-content/uploads/fsqm-files/minecraft-bedrock-free-with-java_GM479516143.pdfIn 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_off00002251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2251 21536 bytes
SHA-256: 8f70433e0a5c5958636833d756cdb5346dd7d7ae30d4fc6f58beefb5704af317
font_01_sfnt_off00005156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5156 18836 bytes
SHA-256: ad94fc69aa6b6efce6b7f50eee8b6d005acbd1b011ebbc598c5501659abc7a0f

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