Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3f9f4d33698057…

MALICIOUS

PDF

47.2 KB Created: 2021-06-03 20:58:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d377a6009fa434493b806755def3cb31 SHA-1: 5baab465f610685f75cf314121023c0d1d49f7a5 SHA-256: 2f3f9f4d336980571c1fe641f4017e4e8be9abad74d8337a8eebf20fef90aaa7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to external websites, including one identified as a malicious redirector. The document body and embedded links suggest a lure for free game currency or hacks, a common tactic for distributing malware or conducting phishing. The presence of multiple redirector links and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/free-robux-android-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/robux-gratis_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-shirt-template-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/pubg-uc-to-pkr_GM1330123889.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/corn-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-free-co_GM431946152.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_004_off00005090.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5090 25364 bytes
SHA-256: 79fc5daceb1c5a785e1cdd083618336b63c652dc81002d160336b30782d805ba
font_01_sfnt_off00008bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD4 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000095bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BF 18308 bytes
SHA-256: 3d682ae06d788585f0d48ef4471ddbfed33e391fd6a867cb0ce2fb595824b3ec

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