Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e71c2c7f1d2da1…

MALICIOUS

PDF

38.4 KB Created: 2021-05-25 09:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d348b9d3af38b4e6904caced110ac60a SHA-1: 6b055214ca8f5277c6b736bb36bae8a40961eec5 SHA-256: 52e71c2c7f1d2da1fbd5ca5570f37388cabf08d17616aba3c4a11389d9b0bf18
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator" or "game hack" lures. The document body reinforces this by mentioning "Free Spins Coin Master" and "CLICK HERE TO ACCESS COIN MASTER GENERATOR". The primary malicious link is https://netcdn.xyz/app/406889139/free-spins-coin-master-game-hack, which is part of a chain of redirects to other PDF files hosted on behikeyacht.com. This suggests a multi-stage lure designed to download further malicious content or lead to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7268

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/free-spins-coin-master-game-hack In PDF document text
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://www.behikeyacht.com/new/public/ckfinder/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003208.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3208 25128 bytes
SHA-256: 0df501cf8f3b8a8168e640540f353f1f515483efa0ccdddc8351a58f14e1b780
font_01_sfnt_off00006bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB0 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000759a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759A 17884 bytes
SHA-256: 18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6