Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e840da82aca7bde…

MALICIOUS

PDF

38.2 KB Created: 2021-05-20 15:21:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 92c95c0f1452244f01ce3923bf7596bf SHA-1: 58138cd69b3c06daf7f7b06fbf8e4e7482e40e01 SHA-256: 3e840da82aca7bde2c536c6f7d261084e33b109adef0352497bb3fb5bb7f7303
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to a phishing or malware download site, aiming to exploit user interest in game-related cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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.xyz/app/431946152/claim-free-robux-game-hack In PDF document text
    • http://sfera-express.ru/images/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://www.roblox.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F0A 30404 bytes
SHA-256: 820f8bb05082254e3cdc5c680e94eef45d8db2b0eabfd92c8b00272e2f7bea0c
font_01_sfnt_off000072e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E4 18696 bytes
SHA-256: 5cf9f9319346d61d0cee7eea738a99b5b91b4687cc89c43f6f5509699f250cff

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