Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23d48347807066b…

MALICIOUS

PDF

34.7 KB Created: 2021-06-25 21:11:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f11e95ecc3bee1767982e305f44402da SHA-1: 906dd84ffd9aa3d65f5b3cb036a5a241c20960c7 SHA-256: b23d48347807066b3e36c55f1bc963e6fbca3cbf2b98ad07f6f0beffd948106c
200 Risk Score

Malware Insights

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

This PDF document employs a common lure of free Robux and game hacks to trick users into clicking a malicious link. The document displays a fake CAPTCHA, a known social engineering tactic to coerce user interaction. The primary malicious link, http://netcdn.co/app/431946152/free-robux-generator-not-fake-game-hack, is identified as a malicious redirector, likely leading to further scam pages or malware downloads. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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
  • 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.co/app/431946152/free-robux-generator-not-fake-game-hack In PDF document text
    • https://lib.unitri.ac.id/repository/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/btools-roblox-hack-2021-unpatchable_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-get-free-robux-august-2021-real_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/spin-link_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-dragon-ball-z-final-stand-cheats_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-online-roblox-robux-generator-no-human_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/roblox-beta-warships-hack_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/pubg-uc-free-link_GM1330123889.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/coin-master-free-download-pc_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/getrobux-now_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id//repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/free-roblox-codes-no-download_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/how-to-hack-and-get-so-much-money-roblox_GM431946152.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.unitri.ac.id/repository/hack-coin-master-apk-ios_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
font_00_sfnt_off000030b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B8 22488 bytes
SHA-256: 4d0702c7d79b8730ec472629b61bed83bc506f84334d8ee9a9369c193ab3277d
font_01_sfnt_off000062bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BD 18992 bytes
SHA-256: 72b672cc8486e0f792382d4c74b578aaab7d167f93544c3d72951f1137b4cb7a

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