Malicious PDF — malware analysis report

Static analysis result for SHA-256 175c4b72edd83db9…

MALICIOUS

PDF

50.6 KB Created: 2021-06-11 10:18:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 22980d40079a7ecc32f2bbeedf8929dd SHA-1: 8b1e7ddb4c322938bfa410b97e38119c2fef7db1 SHA-256: 175c4b72edd83db95b73b16ad75ef69c7a5d9b378b59d3a41a959d036f2f297b
142 Risk Score

Malware Insights

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

The PDF contains numerous links, identified as a link farm, that redirect to websites offering game hacks and generators. The primary lure, 'Hacks Roblox Jailbreak Descargar', and the associated URLs suggest a social engineering tactic to trick users into visiting potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/hacks-roblox-jailbreak-descargar-game-hack PDF link annotation
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-promo-codes-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/master-game_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-no-survey-no-download-2021-ios_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/getbucks-free-com-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-do-you-get-free-things-in-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/code-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005643.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5643 25040 bytes
SHA-256: 24a7478f3409fd4b40031bbdc01e4045ed7fd31826f5b20f7b0513eec885c496
font_01_sfnt_off00008fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBA 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000a12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA12B 18924 bytes
SHA-256: 92870615a997aad2af32e88531bafcefe7429703419de2b7c6e601f11f05cda1

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