Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a2ff793191541…

MALICIOUS

PDF

33.6 KB Created: 2021-06-21 00:14:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d857188f6c30ca51bd87688d6435cbae SHA-1: caa607f2e8c00da4c66d2add273afec00e8a9ae3 SHA-256: fb1a2ff79319154138b892cce5d8e8985b1b0ca4dc3c5e8babbe4feadcbae3b0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF is designed as a lure, using game-related terms like 'Free Robux' and 'Minecraft hacks' to entice users. It contains a large number of external links, many pointing to other PDFs hosted on similar domains, suggesting a link farm or redirector mechanism. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/free-robux-no-buying-apps-game-hack PDF link annotation
    • http://demenagementlandry.com/images/roblox-cheats-to-get-free-builders-club_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-free-robux-redeem-code_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-vpn-for-roblox_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/que-hacer-cuando-te-hackean-roblox_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-hack-roblox-jailbreak-speed_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-hack-peoples-accounts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/how-to-get-free-legit-working-robux_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • http://demenagementlandry.com/images/new-jailbreak-roblox-infinite-money-hack_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://demenagementlandry.com/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://demenagementlandry.com/images/tiktok-minecraft-hacks_GM479516143.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
stream_002_off00002cb8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CB8 22092 bytes
SHA-256: 5ce465076baa55d5c09d9a13ba655178c3de78f1666b88761323b64aedd4b676
font_01_sfnt_off00005d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 19192 bytes
SHA-256: 4fbaf41db8c63be8f6b3f2b5af7fb77ee12b954c355c8fe4d0b7e9eb4279b71d

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