Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c4d65a6cccf1e5…

MALICIOUS

PDF

39.5 KB Created: 2021-05-21 17:14:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ebfee64f1030c4ae2c4601a9915391f4 SHA-1: e57964819806ea8664ec39f756531b050973d5ea SHA-256: 09c4d65a6cccf1e58487ddd7ba24bfa1f7b6ca39342ac3ea8e3e12099b329e12
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a lure for game hacks and links to known malicious redirectors. The document body explicitly mentions "How To Get Free Spins And Coins In Coin Master" and includes a call to action directing users to the malicious URL. This suggests the file is designed to trick users into visiting a site that likely serves malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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-to-get-free-spins-and-coins-in-coin-master-game-hack In PDF document text
    • https://www.bridalguide.com/sites/default/files/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.bridalguide.com/sites/default/files/files/100-free-coin-master-spins_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_off00003539.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3539 24528 bytes
SHA-256: 224c54d095bc2e9c15dbf8f3dba5c3db9d869b3f84234a4e7c95f8ea7d77aed1
font_01_sfnt_off00006c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C93 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00007636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7636 19212 bytes
SHA-256: 71019a74ea90acd1b226b65a6e72a905478abf2aca8081b51e256f0744cdeb13

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