Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bf251e0553a9f2…

MALICIOUS

PDF

33.2 KB Created: 2021-07-23 01:22:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9bf76b4e094ac83935131d6a28814ce8 SHA-1: 885f2f4015f78c89537d530bf8e06a610d25280c SHA-256: 93bf251e0553a9f26f6131e5538a347ca851a9327d3a5a1e97af11cabc25021a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/431946152/how-to-hack-a-roblox-account-easy-game-hack, which is flagged as malicious. The document body also contains a call to action to 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the social engineering aspect. While no scripts were explicitly extracted, the presence of malicious links and the lure suggest an attempt to redirect users to a site that likely hosts further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/how-to-hack-a-roblox-account-easy-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-story-mode-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.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_off00002b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0F 22548 bytes
SHA-256: 71e0180fb9859967e874e6c9bb480f7b671f1266be6ee82f3967da67039d2706
font_01_sfnt_off00005d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D44 18956 bytes
SHA-256: 6b48a3217c7bcc7f5da290e5b055d91e1ce12a3bd260c7f67175daec744aae47