Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7258fc291553d4…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 02:44:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 658f00c67e8d446d204ebba37fd382a4 SHA-1: d539a4275f2cc299d98bd48750bd4a6d81426ebd SHA-256: 6b7258fc291553d48a8cd24c9ca18a5856210765a5e6f5038bf90645a3e993f3
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 0.9865

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 https://netcdn.tw/app/431946152/wings-free-in-roblox-game-hack PDF link annotation
    • https://www.knjigebuducnosti.com/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-kat-hacks_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/somebody-hacked-my-roblox-account-prestonplayz_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-roblox-headphone_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/ways-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/get-tiktok-followers-free_GM835599320.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_004_off00005141.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5141 25184 bytes
SHA-256: 45aa3001e0d7ea051da38d177389ebd3caeb4d3dd6ae167b01dde4db0fae1552
font_01_sfnt_off00008b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B74 18556 bytes
SHA-256: ba8dafbf0b9468820cddf38b872b85b75bcf724ca6a5ad3fb80724a92a855022

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