Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bf64ce75f1a28c…

MALICIOUS

PDF

35.7 KB Created: 2021-07-07 05:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 41641981ceb5862c90f0c6fec8d6eea4 SHA-1: 278819f3ca997a1ba56c07cfd936fae34224f745 SHA-256: 80bf64ce75f1a28c5799ce2b30666026b64ac4e336a9e783d0addc2336bd22f9
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/roblox-promo-code-to-get-free-robux-game-hack PDF link annotation
    • https://loba.com.vn/public/upload/files/free-robux-gift-card-codes-december-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-noclip-hack-jailbreak-outwit_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-in-roblox-2021-mac_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-roblox-account-with-2021-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/kill-all-prison-life-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-inspect-element-2021-pastebin_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-bear-face-mask-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/jak-zrobici-za-free-postaci-w-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-unban-from-polyguns-roblox-free-script-pastebin_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-hack-robux-items-for-free_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-get-free-robux-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/websites-to-get-free-robux_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_off000030b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B2 23392 bytes
SHA-256: 3e04255b56224d16ed1ccd9c8ed416038dec899133258671355e91bbc350f3e6
font_01_sfnt_off00006588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6588 19480 bytes
SHA-256: 9c60ac484ed4d96c21d417994060880eaf1182fdd7210cd7b39094265f956726

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