Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df290668cded50c…

MALICIOUS

PDF

43.5 KB Created: 2021-06-04 02:19:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 17fe62ad5b50657d7f35f3f7923b9438 SHA-1: 90df01731b0b36ffea51e47525d71b12739a8cfc SHA-256: 0df290668cded50c4fb0baabb763d9123f38e7b77464521ad64c020e72063e23
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 0.9865

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/406889139/how-to-get-free-coins-on-coin-master-hack-game-hack PDF link annotation
    • http://library.umla.ac.id//repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/weird-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-lost-world-2021-com_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pubg-uc-shop_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-and-coins-generator_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-group-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/tiktok-free-like-and-views_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hacks-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-youtube_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_004_off00004cc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC8 25992 bytes
SHA-256: 735ab4da0e2de764f3a1dbe3a35c444439dae59188d9e57e04cd19e062fe93da
font_01_sfnt_off00008821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8821 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634

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