Malicious PDF — malware analysis report

Static analysis result for SHA-256 b902be5146b242fa…

MALICIOUS

PDF

38.5 KB Created: 2021-05-22 22:03:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 83c69b9a83b37395b3059b23f94cf321 SHA-1: 4883d00aff4dbb7a8bd88b9dfea8738773c12a74 SHA-256: b902be5146b242fa782e9b03d04ec409dd92ea2ab7558c6fdd2fb712f1b9dcba
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains, specifically advertising 'game hacks' and 'free generators'. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-soins-game-hack, which is associated with known malicious redirector infrastructure. The document body also contains a call to action to 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for client-side exploitation or redirection to a malicious payload.

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/coin-master-free-soins-game-hack In PDF document text
    • http://wattkit.com/images/coin-master-support_GM406889139.pdfIn PDF document text
    • http://wattkit.com/images/toolbox-apk_GM479516143.pdfIn PDF document text
    • http://wattkit.com/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://wattkit.com/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://wattkit.com/images/minecraft-hacked-apk_GM479516143.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_off00003260.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3260 24548 bytes
SHA-256: 6831e07062756ccb6e9dcadc757b56602d0c7a17ccb6adcfdcb4f923dedd5e48
font_01_sfnt_off000069f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F2 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00007677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7677 17712 bytes
SHA-256: a621fa0cf6ecf429ccb0e9762dad0d1971a2824e8730eca88621f5efe7e14995

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