Malicious PDF — malware analysis report

Static analysis result for SHA-256 05377b9d394924fb…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 07:22:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9e5a10b4808bc15e11af693b196c5b99 SHA-1: b11a6c9a041fa33e6a225b61fa205843ea42c401 SHA-256: 05377b9d394924fb5d143562d44c13d65a2a3b42c6b577598ec3a7c959230c07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains text and URLs consistent with a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-do-you-get-free-robux-2021-game-hack In PDF document text
    • https://mbbs.hr/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hacks-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-free-install_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_004_off00004e1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E1F 26492 bytes
SHA-256: 61f766e6feec7d070cef82f303b8be032cc26e796d0ed7b17cc70fde177b549c
font_01_sfnt_off00008aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAD 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9755 19016 bytes
SHA-256: 7afc4835c6f8d200a546e15f78f642ba5dd88c8fac7df04bc3003dd1e9f7232a

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