Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63780d53ff23cd5…

MALICIOUS

PDF

35.5 KB Created: 2021-07-08 15:11:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: de8875d2b51a7407606fd17b4b698edf SHA-1: 9d640a1f1d09c0dce9f8536fad33b2622f3a093e SHA-256: c63780d53ff23cd5638731ecfd944f4d1e0191dad26fc8d55fcc00158466be0e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically advertising free Robux generators and game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to lure users to malicious websites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/free-robux-generator-no-survey-game-hack In PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-when-will-bloxburg-be-free_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/robux-hack-2021-real-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-hack-free-robux-no-downloading_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-promocodes-hack-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/twisted-murderer-roblox-level-hack-with-nopde-engine_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-hack-roblox-accounts-using-inspect-element-2021_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/how-to-fly-jump-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cogp.greentrade.org.tw/image/data/files/roblox-gamecards-redeem-2021-free_GM431946152.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_off000033d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33D2 22324 bytes
SHA-256: 36218b9c15bc54450a2ca74bf5bf9e875dda668495b539695270ed30ba144866
font_01_sfnt_off0000658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658A 19112 bytes
SHA-256: 33dfcb2d47e73eef9736d676cbbc8a7ec86e5e18ee4675d0e02e08c00d2a765b

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