Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d8f1fcd11fa0ac…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 08:02:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c1a15614c1559f910ab9228c5c7658e9 SHA-1: aeb20da89c0a21056768888f44303a00ecb9721c SHA-256: b1d8f1fcd11fa0ac3ab7fb6bb2a6a27fdef8c395180855f912681710c923a164
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'generators'. The document body and heuristics indicate a lure for potentially unwanted or malicious content, likely aiming to download further malware or phish for credentials. No scripts were extracted, but the presence of malicious URLs and the lure strongly suggest a phishing or malware distribution attempt.

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.tw/app/431946152/roblox-fly-hack-game-hack In PDF document text
    • http://pustaka.ust.ac.id/repository/generator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-generator-only-enter-password_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/every-free-thing-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-a-free-roblox-gift-card-code_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/como-conseguir-fuerza-en-boxing-simulator-2-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/obby-for-free-robux-real_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/get-robux-free-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/hack-robux-pastebin-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-get-free-shirts-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/roblox-card-generator-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-auto-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-roblox-not-blocked_GM431946152.pdfIn PDF document text
    • http://pustaka.ust.ac.id/repository/free-robux-clothes_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
stream_002_off00002fc4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FC4 22880 bytes
SHA-256: 252306dfbd876495894e20cf473ce94446e296c8b6a6037ee70fb143424245f4
font_01_sfnt_off000062f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F9 19000 bytes
SHA-256: 85597ddf86b547b1587e1575dd14eab6ad0408ff1d5dd1947e703cb703eeca41

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