Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64d441c73816aa7…

MALICIOUS

PDF

34.9 KB Created: 2021-07-06 01:01:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8dbde4dc6b21c1e797948803dbb64c23 SHA-1: 64ab38ca533fe7214643f1de4a646fda42a77c26 SHA-256: a64d441c73816aa78a3b3c45d1fd58e65826b505d253d0f628fd88008e4daa01
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors and further malicious PDFs, masquerading as game hacks and generators. The primary lure is 'how-to-hack-roblox-2021-game-hack' hosted on netcdn.tw, which likely leads to further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple malicious redirector links reinforces this assessment.

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-2021-game-hack In PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/como-volar-en-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/speed-script-roblox-hack_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/roblox-wall-hacking-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/download-roblox-exploit-hack_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/hacking-roblox-peps_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/hacking-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/best-roblox-hacking-software_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/ninja-legends-roblox-script-hack-novembre-decembre-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/pubg-uc-redeem_GM1330123889.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_off000030c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C7 22416 bytes
SHA-256: 1dd0b309a25d5bd47b865d567f2a9689a3f51ec4878b86c02cbe67344fe1a527
font_01_sfnt_off0000628f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628F 19224 bytes
SHA-256: 952aa56c448a3876108b271681fe1a59f9d49131b8b4cd095e69c290d9073af5

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