Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d7cbc507409efc…

MALICIOUS

PDF

35.2 KB Created: 2021-06-30 17:40:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ba036e0bf9604fe183e7f721292c4da3 SHA-1: 8db318d6100995551774d9e5b6b71b0162b96753 SHA-256: 21d7cbc507409efc1a0d4b0f6f239548ee71f01e0efb7784cea476f8c04fd2e5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a link farm, that lead to pages offering free in-game items and currency for popular games like Robux and Coin Master. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to direct users to potentially harmful sites or downloads. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to exploit user interest in free game items for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/are-there-secret-ways-to-get-free-robux-game-hack PDF link annotation
    • https://digilib.stieama.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-wings-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/join-roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/can-pokemon-go-free-evolve-after-trade_GM1094591345.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-robux-cheat-engne-address_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-unlimited-money-hack-jailbreak_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/pain-exist-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-robux-clothes-for-free_GM431946152.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_off00003129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3129 22580 bytes
SHA-256: a628489b773cdc15c7a79699acfb12ec6085033adfeed97b6bb406ef9430d676
font_01_sfnt_off000063bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BB 19364 bytes
SHA-256: 7d2fc89f64a3dc64b5fd465bf07e074d4b8b8484898c6789be5bc418a022f4ed

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