Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b41ca013484807b…

MALICIOUS

PDF

33.4 KB Created: 2021-07-09 22:24:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8d7eee49daf93cab3a4bb37c418e795a SHA-1: aad20930a421502b7787992e24fb5209581cc432 SHA-256: 1b41ca013484807b777d13db0d505d04bef21c875abbe2f3c0a13d8b806c23c9
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to a malicious domain, masquerading as game hacks and generators. The primary link, http://netcdn.tw/app/431946152/demon-roblox-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites, likely for further malware delivery or credential harvesting.

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/demon-roblox-game-hack In PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-make-a-free-thumbnail-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/cm-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/maxim-games-free-robuxcom_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/https-www-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/how-to-get-202100-robux-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/release-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-clothes-roblox-no-hack_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/roblox-lumber-tycoon-2-i-cheated-for-this-box_GM431946152.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://www.lincolnec.edu.np/userfiles/files/offers-to-get-free-spins-in-coin-master_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E49 21604 bytes
SHA-256: 0794c6b388aba4d1dbdf4ff4b8a02b4555e9db3e3d1a5430d8335662a8191483
font_01_sfnt_off00005d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9F 18912 bytes
SHA-256: a40cbd8e4481698280ba06ff7e008e34ec07e7992da08caf1feb739e7f80d510

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