Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1ab4d96e88f19…

MALICIOUS

PDF

34.9 KB Created: 2021-06-19 07:35:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5efa78e1472cc2761c933b23561ec687 SHA-1: ed3d9e5622f56bb555fd58471e21be509a7ddd6e SHA-256: c7a1ab4d96e88f19286ce2351b4fbcb69482934d8c0b9f93bf310c8c16d453ab
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to sites offering free game currency or hacks. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading potentially harmful files. The document's structure suggests it is part of a link farm designed to attract users searching for cheats and exploits.

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/free-games-online-on-roblox.com-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/free-robux-no-human-verification-not-lieing_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/1-robux-every-second-for-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hack-roblox-jailbreak-2021-new_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-clothes-on-roblox-mac_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/kuso-icu-roblox-hack_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
stream_002_off00002f9e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F9E 22996 bytes
SHA-256: c19c6e4bb2425e06ed81da022e53d229fe2e015311785262688c71056f373b39
font_01_sfnt_off00006348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6348 19096 bytes
SHA-256: 1022e516b45e5398029bb47c6b6c75cce8f716d34d5d3b9b54578f28773fa4ba

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