Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcf880659bbe2eb…

MALICIOUS

PDF

49.3 KB Created: 2021-05-11 07:02:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 734707b0865b609af9b5557e0b9d8580 SHA-1: 8be9516991ae39467f15e588aa4133e42563002c SHA-256: bbcf880659bbe2eb3eb1bbd7778229f5b14c4b6ce4eb41adab7fec29aa44c4e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks for Roblox and Coin Master. The document body and heuristics indicate a lure to trick users into clicking these links, which likely leads to further malicious content or downloads. No scripts were extracted, but the embedded URLs and redirector heuristics strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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-hair-roblox-game-hack In PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-latest-version-hack_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/roblox-18_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-mod-apk_GM406889139.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
stream_003_off00004d54.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D54 36856 bytes
SHA-256: 4c588bc5c05289a6e08b675657367567d308efb7bbf28153ead1b992fd83e484
font_01_sfnt_off00009f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1A 18296 bytes
SHA-256: a0599e440df83d1220524ed19e510b9c2f6a3db0fbd0aff9e889db947f6eea7b

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