Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98c0ac75c20f737…

MALICIOUS

PDF

45.7 KB Created: 2021-05-14 15:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66e5896ef3165cff5835e6a4ec940c04 SHA-1: 2f959104b30953b8d3d66ed2fc2aa809f97f295c SHA-256: c98c0ac75c20f737f3db82a49441b323aac65044810e1a409a7ed42c0261a3dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body, though heavily obfuscated, contains similar lures and URLs. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/free-robux-on-phone-game-hack In PDF document text
    • http://mbbs.hr/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/simplysarc_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/fast-robux-online_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_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_003_off00004a9a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A9A 25936 bytes
SHA-256: 6b654df200452d577c9e4f1b520d612bd444dc0d2df11b4741d008eb821d49ba
font_01_sfnt_off0000861a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861A 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9005 18332 bytes
SHA-256: a8c9403bd24fc6ffbb74b72c8864e8746fc5e9ab0f3a7e731dec7195ce2a3638

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