Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8bdcbd2cba2bc4…

MALICIOUS

PDF

46.5 KB Created: 2021-06-11 03:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7c07e86553d30f29f480b25b98cf32b0 SHA-1: de33134f0059e645dac355c168ade62fc8d4f3e8 SHA-256: ec8bdcbd2cba2bc49540645431f18c9dea46d64bc18536b7f18fb3f8e10ddf3d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a critical redirector URL associated with malicious activity. The document body and heuristics indicate a lure for free game items or currency, a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/how-to-get-free-robux-on-roblox-2021-easy-game-hack In PDF document text
    • https://www.fubode.org/images/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/tiktok-free-account_GM835599320.pdfIn PDF document text
    • https://www.fubode.org/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.fubode.org/images/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • https://www.fubode.org/images/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/tiktok-likes-free-trial_GM835599320.pdfIn PDF document text
    • https://www.fubode.org/images/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://www.fubode.org/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.fubode.org/images/play-minecraft-pocket-edition-for-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
font_00_sfnt_off00005180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5180 28568 bytes
SHA-256: 659a861b1b044967347ddb04defde52a2ad70e62d516dca4b25d93b448b0d41f
font_01_sfnt_off0000907e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907E 19164 bytes
SHA-256: f2997472ea942b0edce641d6a41454e27ebc1d02351322f968d4f5d62f55d9a8

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