Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee0ec9ac9b3fce2…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 01:58:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 66c31d109e5068896907dbc0a6deaf57 SHA-1: 844ee0685f116aaf455c38e92c0cc4c294c0e814 SHA-256: 4ee0ec9ac9b3fce2ba2ead9219b6cc1e4785fa2bdaaf758c13acae672be983df
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, specifically pointing to a URL designed to trick users into downloading or accessing malicious content. The document body and embedded URLs reinforce this lure, with the primary malicious URL being http://netcdn.tw/app/431946152/roblox-redeem-robux-game-hack. The ML classifier also strongly flagged this PDF as malicious.

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/roblox-redeem-robux-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-shuts-down-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-how-to-get-ninja-animation-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacks-for-tower-of-hell-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/pokemon-go-free-7-days_GM1094591345.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-hack-true_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-noclip-download-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/guy-cheats-on-irl-girlfriend-with-roblox-girlfriend_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/auto-speed-hack-legends-of-speed-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-reddit_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-candy-decal-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hack-robux-2021-inspect-element_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-a-free-roblox-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/simplysarc_GM479516143.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_off00003047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3047 22680 bytes
SHA-256: 2e381da14892021459ec38cd1dc67997986a4685f70287034c5a5d88266e4c1b
font_01_sfnt_off000062ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AD 19060 bytes
SHA-256: 2418f9a3910712e154162ba723da80a9ca97054b5f12f554d13c89fac8708d9e

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