Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfcb8cc19f997b9…

MALICIOUS

PDF

37.7 KB Created: 2021-05-13 05:10:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0fb2dea345826dcf8ccfe62000ec6d85 SHA-1: 04c5b39d29f157590ef4ede87ef995767739c97a SHA-256: adfcb8cc19f997b97315b578e0dba796bf93de29e3db1c49041e1799ac8bfac0
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 a 'Coin Master Free Coins And Spins App' hack generator. The document body also contains embedded URLs that point to potentially malicious domains related to gift cards. These elements strongly suggest a phishing or scam attempt designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9469

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/coin-master-free-coins-and-spins-app-game-hack In PDF document text
    • http://businessfit.com/images/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://businessfit.com/images/how-to-get-free-roblox-gift-cards_GM431946152.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_off00003966.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3966 25312 bytes
SHA-256: 879efbb85850b58e7a258ea19ff77816733008d8cecf6592946242ee88c9d9cf
font_01_sfnt_off00007264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7264 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb

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