Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9993063eb226fe8…

MALICIOUS

PDF

42.7 KB Created: 2021-05-19 20:41:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 79b15d2b8ba6dfbfed5af26017110b89 SHA-1: 1f00e27dd9f84b378c73b9f866dab605ac7801d4 SHA-256: c9993063eb226fe8a730c8c752f9af8989cc934a9d9c07a144667b9382131854
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 "generators" to lure victims. The ML classifier also strongly indicated maliciousness. The embedded URLs are designed to lead users to potentially malicious websites or download further malware, likely as part of a phishing or scam campaign.

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/coin-master-hack-pro-gamers-game-hack In PDF document text
    • https://yarburservices.ru/images/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • https://yarburservices.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://yarburservices.ru/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • https://yarburservices.ru/images/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • https://yarburservices.ru/images/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://yarburservices.ru/images/wurst-client-112-2_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_off000049aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AA 25540 bytes
SHA-256: 69f621f5bff0b17277eec4e5e57f091ae8ea86c0d913034d024d56d793e9bb5e
font_01_sfnt_off000084fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84FC 18132 bytes
SHA-256: 7c3ba000fcc9e82367a9cf09e7428e48624a936725f215f3086fe1b405a0b7f2

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