Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07c6391be188742…

MALICIOUS

PDF

33.2 KB Created: 2021-07-19 00:55:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4383de03fb1c820af1f6a9bfc5256660 SHA-1: 10484e3ad159521d248d44917140d9041fc517a1 SHA-256: d07c6391be188742c5211f6d6a20d0679d4d55d3465a2bd4fe1f59c03e532fa6
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 'Coin Master Free Coins And Spins App' and similar lures. One of the primary links, http://netcdn.tw/app/406889139/coin-master-free-coins-and-spins-app-game-hack, is identified as a game hack generator lure. The document body also contains a call-to-action phrase 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the deceptive nature of the content. While no scripts were explicitly extracted, the PDF structure and malicious links suggest it's designed to redirect users to potentially harmful sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6540

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/406889139/coin-master-free-coins-and-spins-app-game-hack In PDF document text
    • http://southernhills-golf.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://southernhills-golf.com/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://southernhills-golf.com/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://southernhills-golf.com/images/daily-free-spins-for-coin-master_GM406889139.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_off000023f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23F5 22644 bytes
SHA-256: 925871019f97dd08a495da1d72675a52c782869d07b84749aa5633189d700452
font_01_sfnt_off000056ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56ED 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000609e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x609E 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb