Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cda3bded7631cb…

MALICIOUS

PDF

34.6 KB Created: 2021-06-19 17:37:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fb20bda5a85f53c3984c441b09399767 SHA-1: d0dda75b2571e475bca591a817adede0f6c4b822 SHA-256: f4cda3bded7631cbe62b9d9537c6434d54f784015fed292ba1b17dbd362d94b5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of game hacks and free currency to entice users to click on embedded links. The primary link directs to a known malicious redirector infrastructure, which likely serves as a gateway to further malicious content or downloads. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow.

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/outwitt-roblox-hack-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-gift-link-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-reswood-prison-lua-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-app-2021-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-g_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-robux-eu5_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-today-daily-links_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
font_00_sfnt_off00002dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC3 23124 bytes
SHA-256: 05a1f65d2d11e622de77aaa912c4eb31385c015e3b26eea5bbb9fe2738893929
font_01_sfnt_off000061d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 19184 bytes
SHA-256: 34026d91a7385b4c95db6a4872f88e17afd710e76e75d4d90a958e541e00f740

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