Malicious PDF — malware analysis report

Static analysis result for SHA-256 990dd2f6a125f73c…

MALICIOUS

PDF

40.0 KB Created: 2021-04-25 19:20:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e4f8fd53c42053f4525730c24e93b1ee SHA-1: d2ab417411afe6394d9d6aff770beccab7986ed4 SHA-256: 990dd2f6a125f73c7efabd1fc2216ed274b0236be0f6a24ae78c0d758901c1d8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically advertising "free generators" and "game hacks" for Roblox. The document body and embedded links strongly suggest a lure to a scam or potentially a malware download site. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious redirection and a lure for user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 https://netcdn.xyz/app/431946152/city-free-roblox-game-hack In PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-infinite-robux-for-free.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/fisicuffs-roblox-cheats.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/online-free-robux-generator.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/unlimited-jump-hack-roblox.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-all-gamepasses-for-free-script.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/how-to-get-free-robux-on-roblox-mobile-2021.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/free-robux-codes-2021-march.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-hacks-jaibreak.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-jailbreack-money-hack.pdfIn PDF document text
    • https://lib-stie.yai.ac.id/repository/roblox-legit-free-robux.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
stream_003_off00003f0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F0F 25660 bytes
SHA-256: 327764331250891a2483002a4f9d07661f7d40053ae4184d4dee178f0d1def4c
font_01_sfnt_off00007a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A22 18352 bytes
SHA-256: d4bb7cc52d5b900b0e117a492da1b84ce08282b31f9cae10152eb76cd90100a4