Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d0c956804f3159…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 09:26:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75b0adfa6b6ec01f5545eaf19e2eec26 SHA-1: d2155244e99479c4db9d0a288078ae5eb3195153 SHA-256: a1d0c956804f3159d2a2cb1c3d478d72bd0b521a154fdfedecd0831c0b7a4950
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 0.9971

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.xyz/app/406889139/mcpe-master-hack-coins-game-hack PDF link annotation
    • http://www.natconveyors.com/uploaded_files/userfiles/files/roblox-verification_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.natconveyors.com/uploaded_files/userfiles/files/free-robux-no-verification-no-survey_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b42.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B42 25084 bytes
SHA-256: 8bb02e0e3f231bd9459f51d294438db381d30cf9701e8bcf1deb7921230b3f96
font_01_sfnt_off00008554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8554 17892 bytes
SHA-256: 0c63e033d5ffe887ffec85b5cafaf72e8c864209b86636c790ff2846ce341ff6

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