Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4df4833d96d513f…

MALICIOUS

PDF

36.6 KB Created: 2021-06-29 21:47:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: daafb344823b77c48a2b55fc3f6dd7e5 SHA-1: 5d4e6ac0e4bde2c42324afba5e67676099c40458 SHA-256: c4df4833d96d513f1fb7c871f2bda6bc7591a2caf814e646a2d36b38d9d90ca3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as game hacks and generators. The document body and embedded URLs strongly suggest a lure to a site offering 'free cars in Roblox Jailbreak', which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely leading to a further stage of infection.

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.co/app/431946152/how-to-get-free-cars-in-roblox-jailbreak-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/descargar-hack-en-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-uc-or-bp_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-robux-generator-no-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-apk-ios_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-how-to-get-free-robux-unlimited-100-working_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-on-roblox-on-pc_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-trainer-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-free-holo_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/money-hack-sur-sunset-city-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-faces-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/today-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/best-hacks-for-frappe-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-no-download-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-lucky-patcher-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/cheats-for-dragon-ball-rage-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-robux-reddit_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_off00003667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3667 22816 bytes
SHA-256: 4e8f4595a680221d02bf362f7e597d53f8e51103b2e61ac5aec10bb66a68ea40
font_01_sfnt_off00006976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6976 19372 bytes
SHA-256: a8da7da3db41893f397a02004bfb66031566ec4d3521125bac37df3cd3f20f30

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