Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d8152e6224b9c5…

MALICIOUS

PDF

37.0 KB Created: 2021-07-08 00:16:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 026d8768cd12cae599b178b537d6811c SHA-1: 8856a022cdffb397d6bb7bf0381e300fb836c2d5 SHA-256: c0d8152e6224b9c5f8defcdd87d5489d6a75042612a7d07a8d81b427e8ffd1ee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a 'free generator / game hack' website, a common lure for phishing or malware distribution. The ML classifier also flagged this PDF as malicious. The document's content and heuristics strongly suggest it is designed to trick users into visiting malicious infrastructure, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://netcdn.tw/app/406889139/how-to-hack-coin-master-with-root-game-hack In PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-peoples-account-in-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/pokemon-go-free-pokecoins-no-human-verification_GM1094591345.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/www-roblox-hack-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/claim-roblox_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/noob-vs-pro-vs-hacker-vs-god-minecraft_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
font_00_sfnt_off00002fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE0 22820 bytes
SHA-256: 95bb875ed063730f40011e1a7bfb520d5f5a90b70e474863244d4e95e1ccd272
font_01_sfnt_off00006309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6309 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 18532 bytes
SHA-256: 20637ff70b6c74965f19f977f66c5a6202ab351393aa3df1687bc9e39f472cc5

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