Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cda80b7bc7c9f2…

MALICIOUS

PDF

43.0 KB Created: 2021-05-12 05:35:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a88981121703c51cb128428350c7e97f SHA-1: a63a0e8b72081d4aea9ac3fc69596c20ca7eafdc SHA-256: f1cda80b7bc7c9f247f8201e1c72175b94426f1445d7f7a01e4d377a3767b8c2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external websites, many of which are structured as SEO link farms for game cheats and generators. The ML classifier strongly indicated maliciousness, and the presence of a call-to-action phrase suggests a lure for users to click these links. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/coin-master-free-spins-app-for-iphone-game-hack
    • http://lib.fekon.untad.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/robux-generator-no-verification-needed_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-links-to-coin-master_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/roblox-executor-free_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-spins-apk-2021_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-hacks-for-pet-food_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/microsoft-roblox-rewards_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/freerubux_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-coin-master-cards_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/roblox-robux-hack_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-robux-survey_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/coin-master-hacks-for-android_GM406889139.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/robux-no-human-verification_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://lib.fekon.untad.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c48.bin
31da0da99269109386bd8f1c85f7c4bef08fe950678df843362ee7b348852931		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C48 25780 bytes
font_01_sfnt_off000086b3.bin
4aba056016aeb65aeba62e03d7234ea924a4b970c64610ba6e784186ab2969a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B3 18052 bytes

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