Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3db667f8752dc59…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 19:12:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d5247c1a3bd5e0e1a0d0835e5e3c415c SHA-1: 4a6f8840e22a384bb64002587892f6f755756414 SHA-256: a3db667f8752dc59a5de81ed2b78299b391332fa36b1c70351293630befd3aab
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'free generators / game hacks' for popular games. The primary redirector URL identified is http://netcdn.tw/app/431946152/freerubux-game-hack. The document body and embedded URLs suggest a lure to download potentially malicious content or visit further phishing sites. The ML classifier also strongly indicated maliciousness.

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/freerubux-game-hack In PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-hack-roblox-builders-club_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-free-t-shirt-upload_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-download-speed-hack-on-roblox_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-a-free-dominus-in-roblox-2021-march_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/rbxdemon_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-roblox-hack-no-survey-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/hacks-de-roblox-para-cualquier-juego_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-roblox-codes-2021-multiple-people-can-use_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-100-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spin-and-trading_GM406889139.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_off000030b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B4 22540 bytes
SHA-256: c8296348940e6769fe77378771e7e617b5474eee73244a568807795f20ba1039
font_01_sfnt_off000062da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 18572 bytes
SHA-256: a4910544a3301e21d5425f47d387c0dcd2b1454e32e0c532c02705c370365377

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