Malicious PDF — malware analysis report

Static analysis result for SHA-256 9119100f64ea5462…

MALICIOUS

PDF

46.4 KB Created: 2021-06-07 10:51:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ddbed6601d20681d0df6fb391b7217a8 SHA-1: d60415ceb7e2a463308748ba9207c0e942923247 SHA-256: 9119100f64ea5462c258020427fcce61f47458ec637926bb0a07cb82236e7f00
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 0.9832

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.tw/app/431946152/robux-help-com-to-earn-free-25k-robux-game-hack PDF link annotation
    • https://razredna-nastava.net/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-generator-com_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://www.roblox.coIn 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_004_off0000518e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x518E 26996 bytes
SHA-256: 3fd95c613fe66d9a63e242b0605db1cbc67adf7e152029e56fd8e72354a72a71
font_01_sfnt_off0000904b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x904B 19180 bytes
SHA-256: f163a70ee42af925d0e5d4f8f10c6ed39cd21f33477b8974f6638e786ebab209

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