Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fb9d4b508cc293…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 12:31:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d50a05faf2d5a825a332fc3e7eee0f68 SHA-1: decfed1dedf167db35695f68244a66dc47c20234 SHA-256: f0fb9d4b508cc2937f00283ec8fc7bb5bc4723475aa1dd66fa89930005fb12b7
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-com-roblox-game-hack. This lure, combined with the 'free generator / game hack' theme, strongly suggests a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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/free-robux-com-roblox-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-cheat-engine-64-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/download-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-how-to-put-gear-on-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-free-robux-easiest-way_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-invisible-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/real-robux-hack-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-shirt-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pastebin-robux-hack-911_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-gfx-free-render_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/give-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/rblx-gg-tons-of-robux-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/best-lvl-7-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000032a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A1 22296 bytes
SHA-256: 4de31716a2eb0e488323718053f2136f8ca4f5d1bb46a675a897f946757207f8
font_01_sfnt_off00006465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6465 19052 bytes
SHA-256: f1c402a5b139f7054ce39ccfb5800536152a5b826a5c5a7ec81e6f9b67a9d2f8

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