Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dcb3b6eb003bd9…

MALICIOUS

PDF

33.8 KB Created: 2021-07-19 20:11:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 22de6d1bacfa6f355480a430889cb024 SHA-1: 60cca31e3a62be76e46af179401ec5baa8073ac5 SHA-256: 81dcb3b6eb003bd96f5f4fb33a39d5296c8331a14630154d7b63c403b9c96ea6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/835599320/get-free-likes-on-tiktok-game-hack. The document body and embedded links suggest a lure for free in-game currency or social media engagement, which is a common tactic for phishing and malware distribution. No scripts were extracted, but the presence of malicious redirectors and the lure indicate a high likelihood of this document being used as a phishing attachment to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/835599320/get-free-likes-on-tiktok-game-hack In PDF document text
    • https://www.invertsports.com/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • https://www.invertsports.com/images/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.invertsports.com/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://www.invertsports.com/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.invertsports.com/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://invertsports.com/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.invertsports.com/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.invertsports.com/images/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://www.invertsports.com/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://www.invertsports.com/images/how-to-hack-into-someones-roblox-account_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_off00003002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3002 23328 bytes
SHA-256: c21bf379947c418cdb88398b55a8fcf5df82f4a90b9eedeba06073083cf9ac4a
font_01_sfnt_off000064bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 17456 bytes
SHA-256: 782ce757928ab8849be8d7d6232199a595fd3f8ee03de5cb15c7b9ee803e6cfd