Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99e72dd056190dd…

MALICIOUS

PDF

35.9 KB Created: 2021-05-20 18:11:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ff19f6d6de88524d935015c9ac7ba973 SHA-1: d9189d8f01d1f82c43ca6511ebd611a346a63b2c SHA-256: e99e72dd056190dd979b4fcb84979765fb2184f03cb22d2fd53df6b2949ca391
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector leading to a 'free generator / game hack' lure. The document body also contains a call-to-action phrase, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/minecraft-free-game-hack In PDF document text
    • https://www.gymun.cz/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-online-without-human-verification_GM406889139.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
stream_002_off000033c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C6 25416 bytes
SHA-256: 2e9914133545de84a614d0f6b0fd89dd3de9aa31e2a2e8d459c921b897274fa9
font_01_sfnt_off00006d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 17568 bytes
SHA-256: 2778e064ee8e4e3a4bd3984a17bb7eaaeefaa41a67eb131b8ade69fe1653bbfc

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