Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd827c9daa22e4d7…

MALICIOUS

PDF

34.3 KB Created: 2021-06-28 12:28:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac87b5a8603f0ae638afaa4dd82a29ad SHA-1: 4982fb86d8c7243fade756b820a7bf34195d1553 SHA-256: bd827c9daa22e4d7e1bfd0170188d5ff27b6ae8329d82dda83146ae4e99bfcef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, often disguised as 'game hacks' or 'free currency generators'. The ML classifier strongly indicated maliciousness, and the presence of multiple redirector links suggests a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/hack-in-roblox-players-acc-com-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-teleport-yourself-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-install-cheat-engine-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-cheat-in-roblox-welcome-to-farmland_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-survive-the-disasters-point-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-how-to-get-free-limiteds_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-make-a-roblox-shirt-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-sword-fighting-tournament-points-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/op-rewards-free-robux_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_off00002eb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB8 22352 bytes
SHA-256: 716ecf7f1e04ef82ec04498a74b7bebae88432200b83dbaa2df757da023f0380
font_01_sfnt_off00006067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6067 19248 bytes
SHA-256: 066b43c6fc64ee320e78e71c8a4e1abafa090d36bbd2fab9e95e8deebd883548