Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8aec17b6516fdc0…

MALICIOUS

PDF

33.7 KB Created: 2021-07-04 09:53:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 1bbc73eb82ba3016d1eeb1699df9a965 SHA-1: 069495fc70216f911293ebfa2e4a16b4ef86501e SHA-256: c8aec17b6516fdc0eaab6de8ad18ea7067744879ff27743fb5443abc4ee09bc4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, that direct users to websites promising free Robux, Coin Master spins, or Minecraft hacks. The ML classifier strongly indicated maliciousness, and the presence of these links suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the document's structure and embedded URIs point towards a social engineering attack designed to trick users into visiting potentially harmful sites.

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.tw/app/431946152/how-get-free-robux-on-ipad-game-hack PDF link annotation
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-exploits-no-key_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/money-cheats-sims-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-download_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-cheat-for-rocitizens_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-free-to-play_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-a-roblox-gamw_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-hack-someones-roblox-account_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_off00002db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB7 21968 bytes
SHA-256: 7512eaf03bd1face104b422f1eb19a8a4dee25f5b6025021727b556c01cdc4a4
font_01_sfnt_off00005df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF5 19148 bytes
SHA-256: c14583df14402d520ecc6656d7689b7feb4070c30b5e82657951f82577670743

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