Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04aa0ba3b737741…

MALICIOUS

PDF

35.0 KB Created: 2021-07-09 16:41:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f4fa89012f3f716fef1ac216d82bda07 SHA-1: e876e649ec2828985f67f55b486e54a64886d0f1 SHA-256: c04aa0ba3b737741c2dc237fc6cd11c8b649088913da89f6ca0b667e7d494e80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as free game hacks or currency generators. The primary lure is the URL http://netcdn.tw/app/431946152/free-robux-kid-friendly-game-hack, which is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering tactic to drive users to potentially malicious content, likely as a first stage for further compromise.

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-kid-friendly-game-hack In PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/how-to-get-flyable-pets-in-roblox-free_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-coin-link_GM406889139.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-draw-roblox-bucket_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/roblox-retail-tycoon-hack_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/roblox-robux-hack-deutsch_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/thx-hacker-for-opening-roblox-d_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/pokemon-go-free-promo-codes-2021_GM1094591345.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/no-bad-words-hack-roblox_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/roblox-robloxian-20-free_GM431946152.pdfIn PDF document text
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-coin-master-spins_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_off00002fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBC 23020 bytes
SHA-256: c7033c1dad229c1dc864ece7fb91e374700e841f77cd137bdb921b86ff136e0e
font_01_sfnt_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 19264 bytes
SHA-256: f1cb0ea9790fd9eec1381d6ece3e0061b345793659c4b6d6641704be3ef20a74

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