Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a772aaf21723c72…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 07:59:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7a6d1ff2bac7b53afbaf9bbf237e0ce8 SHA-1: 40c272b801512119cbd4153cea715c6ba6825eed SHA-256: 8a772aaf21723c72f3c017914c447c608be5e7de814aca28ecbe15f6c36c9eec
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links disguised as content related to popular games like Coin Master and Roblox, with a primary link pointing to a suspicious URL. The presence of a link farm heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt.

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/406889139/coin-master-free-spins-link-game-hack
    • https://digilib.stikesindramayu.ac.id/repository/how-do-u-get-robux_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-roblox-accounts-whit-gamepasses_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-no-inspect-may-2021_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/new-cheat-engine-2021-working-roblox-jailbreak_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/brother-cheating-on-his-roblox-girlfriend_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-free-coins-facebook_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/wurst-115-2_GM479516143.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-premium-roblox_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/free-robux-no-scam_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/superhero-free-roblox_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-a-free-roblox-gift-card-code_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-free-diamonds-on-royale-high-roblox-hack_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/little-kid-caught-cheating-on-his-roblox-girlfriends_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/the-hacked-familys-basement-roblox_GM431946152.pdf
    • https://digilib.stikesindramayu.ac.id/repository/how-to-get-black-wings-in-roblox-for-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000339b.bin
b1335ac53117fe8834be4c084ebdf021304a3167fa02ae58636b068f4fddc034		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339B 22496 bytes
font_01_sfnt_off00006580.bin
01b831504896dfaed35d51ec646485350627a831fcdd06f8660974e1004fbd35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6580 18344 bytes

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