Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfd411dd8974087…

MALICIOUS

PDF

34.1 KB Created: 2021-07-10 00:06:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5cdb01a1527caec76c8d5e0f9028a89b SHA-1: adb03adefde590afb1f178359ea7c16f9ec3495d SHA-256: 3bfd411dd89740871d3de516be875cc2477057de052113555ce312e544e81996
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and in-game currency. The primary lure is a link promising 'how to hack roblox accounts for robux', which leads to a known malicious redirector. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful sites.

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/how-to-hack-roblox-accounts-for-robux-game-hack In PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/pokemon-go-free-balls-2021_GM1094591345.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-free-gold-chain_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/earn-free-roblox-gift-cards-legit_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-hoofer-art-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/rewards-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-roblox-tix-hack_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-to-hack-roblox-and-get-infinite-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/nopde-engine-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/roblox-robux-hack-lonks_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/how-i-can-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.6636.com.tw/ad6636/upload/files/make-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_off00002d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D29 22632 bytes
SHA-256: d18c7cc4d11c71e474f0c2124615f0595b1d0d8e9c5065373f22d1e437afc284
font_01_sfnt_off00005f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8E 19228 bytes
SHA-256: c30d944de0a6baf9276c4865844fcb990da37fa04730b451441052e57c665125

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