Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6208fa52c4dff3f…

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 08:59:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 69ae99442721a4d6908cae8f6020a1a5 SHA-1: dd4f7c121458b5a2253d59695fc664a3ebe2edde SHA-256: a6208fa52c4dff3f4afc076750229f2145193737bc9f8587b04410c2fa370d4e
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/coin-master-attack-hack-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/master-coin-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-can-you-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-free-generator_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn 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_004_off0000502a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x502A 24212 bytes
SHA-256: fe4a3b1e5f8cc0b3435612264350ffc23baa320f9b10dfd19e87221e22838146
font_01_sfnt_off00008790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8790 17716 bytes
SHA-256: 70399db0e332628e5b8235b330fa983a1f520a6186e18c08c1293487a921032f

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