Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cfe4941483a7f60…

MALICIOUS

PDF

36.7 KB Created: 2021-05-10 13:35:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fe061b4b45311aa4f2efac1cd2caadb1 SHA-1: 16524dcf2706612c646fd69c0444aef04e3f408f SHA-256: 2cfe4941483a7f609fe38016353f80b194a04fec553011076db0e96d4860bbdc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting a "game hack" lure. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9368

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/406889139/how-can-i-get-free-coinsn-coin-master-game-hack In PDF document text
    • http://rexingen.info/images/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/app-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://rexingen.info/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://rexingen.info/images/coin-master-free-coins-and-spins_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_003_off000036f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36F2 24616 bytes
SHA-256: a9688d5e0804da2cce0ab320aa289149961d82d9efa9a57648b823170362c027
font_01_sfnt_off00006f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2F 17872 bytes
SHA-256: 7acb2ea7ca48292ff84e38b925b00f57c40a05e644be1ec1a4eb48c7cb3542c1

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