Malicious PDF — malware analysis report

Static analysis result for SHA-256 c561e94f6a86d1a9…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 12:44:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c494dc283a1eb299dbf420ad85e60529 SHA-1: 7ecb6be60a8703a9f31742ee4ec76c2cf8f02836 SHA-256: c561e94f6a86d1a95ebb9b3e4f76a457302f57cc8b6912b8e646c719816f7031
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/479516143/mcpe-116-game-hack PDF link annotation
    • https://adoz.cz/ckfinder/userfiles/files/free-3d-online-games-like-roblox_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/get-robux-for-free-com_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/gametestrobloxcom-robux-hack_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/trigon-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-and-tix-generator-no-survey-or-download_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/hacks-for-mad-paintball-on-roblox_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-assassin-how-to-get-free-knives_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/server-for-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/how-do-i-do-if-i-was-hacked-roblox_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/roblox-hacks-no-virus-100-working_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_off0000313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313D 22800 bytes
SHA-256: 1a22d790418ab66fbe8f08f2cd1557c61352f14796db76d998a1cce742793177
font_01_sfnt_off000063b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B4 18080 bytes
SHA-256: 6cb16de7a3e9a31a41ccc00114520e051fe17f168efe9371a0f2f5578cc83e42

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