Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ac88596c8d06b8…

MALICIOUS

PDF

42.3 KB Created: 2021-05-13 12:52:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 04d77b6098e04600c48fd81ce28a520d SHA-1: d1b9c4a81f567693ab9e8337051fb2d97fcd9bdd SHA-256: d8ac88596c8d06b8cdfeeda16c6bd732bf38f1d68e896c45d37f6127b771681f
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/406889139/coin-master-free-spins-link-facebook-game-hack PDF link annotation
    • http://mycounty.com.ua/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://mycounty.com.ua/images/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/roblox-free-bundles_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/minecraft-gun-mod-download-free_GM479516143.pdfIn PDF document text
    • http://mycounty.com.ua/images/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://mycounty.com.ua/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://mycounty.com.ua/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_003_off0000484d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x484D 25376 bytes
SHA-256: 4c10a8b82413b62373ebe2cb106b9766f940f4126a9addb20410d17bd5b1659f
font_01_sfnt_off00008310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8310 18212 bytes
SHA-256: f7455627fca89e56f376775387bf90d900308051c02650cf5925308effc7bf6a

Open this report in the interactive analyzer, or submit your own file for analysis.