Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf47e8bdacc37861…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 04:29:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d5209e11af2a7094e2b162bc5188aee8 SHA-1: 21d9c7d5122f879f69e42f0f322a4fb142de1ca0 SHA-256: cf47e8bdacc37861d5b044c7098ea7cb8729a61e3ef18bcfb6f1ba32683ecc8b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file 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 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.tw/app/406889139/coin-master-heaven-free-spins-link-game-hack PDF link annotation
    • http://library.ulb.ac.id//repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/tiktok-free-without-downloading_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/pubg-uc-qiymtlri_GM1330123889.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-trainer-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-cheat-in-leavels-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-online-game_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-skins-ps4_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/https-wwwfree-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-usernames-and-passwords-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-no-verification-easy_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-gift-card-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-no-human-verification-20212021_GM431946152.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
font_00_sfnt_off000030ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30EF 22792 bytes
SHA-256: 3731a32e8d48674d75eee32fe643a0cb209320d3bdf9647355d94d281666cc31
font_01_sfnt_off00006417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6417 18460 bytes
SHA-256: 9b0749f4ce3cc6ef8d94274498cbad61dbe97f6b94b6ff37cda003e795bdfc4f

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