Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab63945c5407deb…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 13:40:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 098f8055192b766c46896bd25defbbcc SHA-1: cc6cc95710ca01f35c413bb1eff9b91f73b8656b SHA-256: 4ab63945c5407debb8ed2bb27963c044af51f5f678b656afb000145d118e1937
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, including invisible ones, that redirect to sites offering 'free generators' or 'game hacks', such as 'get-robux-today-game-hack'. These links are designed to lure users into clicking, potentially leading to phishing or malware download sites. The document body and heuristics indicate a strong SEO link farm and CAPTCHA lure strategy, aiming to attract users searching for in-game currency or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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
  • 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/431946152/get-robux-today-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-generator-no-survey-or-captcha_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-when-will-bloxburg-be-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robux-gratis_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-a-free-gamepass-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-today-only_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/reaper-quest-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/mining-saimulator-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-games-that-work-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-hack-stats_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/robux-hack-me-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/denisdaily-free-robux-website_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-quick-generator_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-items-on-roblox-2021_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_off00002ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF8 22332 bytes
SHA-256: 660a5b5c491809663764d92454f5e707f9269975b609bfc914ad5f1f02bcf50e
font_01_sfnt_off000061c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C9 19012 bytes
SHA-256: 9215c9201218ab6c8d10252376bfc8cd06165ecb9060389a52a88ae940a9f8ad

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