Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdbacbe0caff6f5…

MALICIOUS

PDF

34.5 KB Created: 2021-07-08 00:03:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3b3738908ebc94a1677c19aa2303f57c SHA-1: fb431d3df7929d659b3dbde2e13fd341e7abaeea SHA-256: 2cdbacbe0caff6f502e784ab8aa8426b38ea72bb57aeb3c1d630cb8883cc7cdf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to a malicious redirector disguised as a game hack generator. The document body and embedded URLs reinforce this, pointing to various 'hack' and 'free generator' sites, with a primary malicious URL identified. The presence of embedded URLs and the nature of the lure suggest an attempt to trick users into downloading malware or visiting malicious sites.

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/406889139/hack-coin-master-apk-358-game-hack In 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/how-to-hack-in-roblox-jai_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-sell-clothes-for-free-on-roblox-place_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-clothes-roblox-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-how-to-use-cheat-engine-62_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-tool-online-no-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/collect-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/serveur-discord-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/welcome-to-my-free-modeled-game-on-roblox_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/tiktok-free-view-59_GM835599320.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cone-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-accopunt-passowrds_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-coin-master-free-spins-in-email_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_002_off00002f13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F13 23072 bytes
SHA-256: d5d0f0c34ada10ec7b03c9ee042e5df819f21a6eb9e049674822973310459c2e
font_01_sfnt_off000062e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 18696 bytes
SHA-256: c627d1d626f2c96a0d5ced4df9cdbc4578256281fc818842ecc62acaf097b54d

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