Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f395406a8b9e805…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 17:11:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ed1496f1d5b6310bc0e75387cfcff477 SHA-1: 3ebd75592d8ba5e8de5181a929a322fa66297b5d SHA-256: 4f395406a8b9e80548d1ab7b97422b8d0c9e84e1d0d1da88da6334fa5e3d5241
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs a "free generator" or "game hack" lure to trick users into clicking malicious links. The document contains numerous links to external sites, many of which are part of a link farm designed to improve search engine rankings for scam-related keywords. The presence of a fake CAPTCHA prompt further indicates a malicious intent to deceive the user into executing further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/free-minecraft-hacks-game-hack PDF link annotation
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-and-no-download_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-pick-a-side-hack_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/cheats-used-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-model-roblox-games_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/paginas-para-hackear-usuarios-en-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-get-free-stuff-in-roblox-without-robux_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/bug-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-counter-blox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/which-cheat-engine-address-is-robux_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-combo_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-buy-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/roblox-cheat-engine-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/destroying-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/how-to-download-a-hack-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elearning.maspro.sch.id/__statics/gudangsoal/files/free-tiktok-accounts_GM835599320.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
font_00_sfnt_off000035e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35E2 22432 bytes
SHA-256: c6c308153afea15f4b94a245385da7fba80c94c4dfa49310f1abcbe5ac2ad2c3
font_01_sfnt_off00006713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6713 18024 bytes
SHA-256: 8f8fda7ec61391a8021437fea0b23093d98da4680992c9daa6c8728c6d82e4f2

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