Malicious PDF — malware analysis report

Static analysis result for SHA-256 4039bcba1f31eac0…

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 18:22:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4567616798e5d63f767d3230acb7804d SHA-1: 50099b26dab31be3d9e2974f408b1e7b38182dd6 SHA-256: 4039bcba1f31eac0a048037a39a99371fd460b21ebcaa959ee8201d0c33cfdf4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The ML classifier strongly indicated maliciousness, and the presence of multiple links to similar lure content reinforces this. The document likely serves as a lure to trick users into visiting malicious websites, potentially for credential harvesting or further malware delivery.

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-codes-no-human-verification-game-hack In PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-roblox-games-for-girls_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/elysian-hack-roblox-download_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/cool-tshirts-for-free-roblox-sharkblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-free-diamonds-on-royale-high-school-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-download-roblox-mod-apk_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/guuudd-info-robux-hack_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-roblox-accounts-pastebin_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-ultimate-driving-westover-islands-money-hack_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-how-to-get-tge-free-trial-trial-bc_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-make-a-free-ad-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-cods-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/hack-de-roblox-robux-para-pc_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-hack-gamepasses-on-roblox-ccv3_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/hack-coin-master-apk-ios_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/hack-roblox-pastebin-com_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/pokemon-go-free-pokemon_GM1094591345.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-robux-easy-no-hack_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_off000031ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AB 22428 bytes
SHA-256: 5d5d916937cc7679f4c38b561f7907bdde20fc8fe4e681991c00d7aa8791dce0
font_01_sfnt_off0000639f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639F 19508 bytes
SHA-256: 2dfde449b123a820f71ecd143a07ff41e89d4c72f15aa4e6fc945965a2c79889

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