Malicious PDF — malware analysis report

Static analysis result for SHA-256 1609ee69d72b8cd4…

MALICIOUS

PDF

41.3 KB Created: 2021-05-16 09:05:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0b7015a7e5887d046d424d04d9678350 SHA-1: a096c92ef5716f857372495059b6db5fdc6db4f3 SHA-256: 1609ee69d72b8cd49d6b87e5ba87319468364b117104f3177d1a2df1cb878714
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and cheats. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. The document body, though heavily obfuscated, contains URLs consistent with the observed malicious links, suggesting the file's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/coinmaster-com-game-hack In PDF document text
    • https://razredna-nastava.net/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-xbox-360-free_GM479516143.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_off0000468f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x468F 25588 bytes
SHA-256: 9e243b5e869c7d02fb65be890e664deb6e5f2d5070f4c0c68b9324b5c489fdae
font_01_sfnt_off00008090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8090 17808 bytes
SHA-256: 35201c89c21c447e3a5acf437bfd3f20f3f3410cea54d73bd8e308df4a931eaa

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