Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6884cad570704d9…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 07:12:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 01f949d8204f3ba5b9e287c2288d836c SHA-1: 2ee589d545de9649ac7c885c402cb095c7a29b67 SHA-256: f6884cad570704d9d2791065b710f469d28bc7f0dc9f51c7753da1d91c18d540
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9796

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.online/app/431946152/how-to-get-anything-on-roblox-for-free-game-hack PDF link annotation
    • https://www.legclub.org/uploads/files/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-android-root_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fe1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE1 25192 bytes
SHA-256: 2802fb9525603359ff482dd6fc50b83416ddeb4db968d6bd992eeda542f3611c
font_01_sfnt_off00008a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7E 4056 bytes
SHA-256: c1325c20934def5e4ab38c1f040d80f010fc054c1d99f2f574e04bfa2131b7ee
font_02_sfnt_off00009851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9851 18968 bytes
SHA-256: 6d4859aa78e57ad168fa5e975e124a0d9fc03fe0ac027b256a6e9815903702f2

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