Malicious PDF — malware analysis report

Static analysis result for SHA-256 682d9b4af7349b27…

MALICIOUS

PDF

34.9 KB Created: 2021-06-22 02:32:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d79453662e57291f330033eff52ccff SHA-1: dd278f6637701ac4df6f59c4d7d14bcc13cf6291 SHA-256: 682d9b4af7349b27c5b2a2ccc1fa10888df3a6c7a77c8c62e724c8281b9eba51
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic suggests this PDF is designed to drive traffic to potentially malicious or unwanted content. The document body itself contains references to hacking and free in-game currency, reinforcing the lure.

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/406889139/apps-to-hack-coin-master-game-hack
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-get-800-robux-for-free_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/roblox-work-at-a-pizza-place-cheat_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/minecraft-tower-defense-hacked_GM479516143.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/roblox-robux-codes-2021_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-hacks-for-gold-cards_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-roblox-accounts-ebay_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/minecraft-gun-mod-download-free_GM479516143.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-coins-on-coin-master-2021_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/roblox-robux-hack_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-roblox-items-2021_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/robux-adder_GM431946152.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/coin-master-hack-iphone_GM406889139.pdf
    • https://www.polresbadung.id/new/public/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003135.bin
78b4594b02989805d9c7431aa0d9d15f66b0b7d925d65059ae94e6ff1e0d4c61
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3135 23352 bytes
font_01_sfnt_off00006616.bin
f0873b9a9a3567aab3602ed3b46c72e29c0674406730caa0d836ec2652e18507
pdf-font-stream PDF embedded font (sfnt) at offset 0x6616 18180 bytes