Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1c8975323b60df…

MALICIOUS

PDF

44.4 KB Created: 2021-04-30 00:49:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 559557ac6b35b2e8bace3929409bd923 SHA-1: 381fc73320c4d63bdee417ad31305f522c2f7f71 SHA-256: 7c1c8975323b60df64412558d41bc19d1cd5e42af259e03b079c458cb50ab50f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generator / game hack' lures. The primary URL, https://netcdn.xyz/app/431946152/2021-robux-free-generator-no-survay-no-human-verification-game-hack, is flagged as a known malicious redirector. The document body and embedded URLs suggest a social engineering attempt to trick users into visiting these sites, likely for credential theft or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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/431946152/2021-robux-free-generator-no-survay-no-human-verification-game-hack In PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-free-t-shirt-for-girl.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-royale-high-free-vip-server.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/free-robux-car-codes.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-cheat-on-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-hack-glitch.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-in-roblox-to-unlock-elemental-dragon.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-hack-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-get-free-gear.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/how-to-become-hacker-in-roblox.pdfIn PDF document text
    • http://technibuild-group.com/uploaded_files/userfiles/files/are-free-robux-games-real.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4394 26620 bytes
SHA-256: e6fddf8eb70cf6fb0ea2f9be21c2379b1dc6007924fe07e51a031b9fd17f8e33
font_01_sfnt_off00007e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E13 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000087c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C4 19556 bytes
SHA-256: d0b5ae972817a501e1ab5f5167e68362cb704ba7333a715a26884111146a6bd7

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