Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c105fcc42bd822…

MALICIOUS

PDF

36.0 KB Created: 2021-07-07 19:08:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d72ec3c4c36b780d5dbaa9d4fb0b053b SHA-1: fda889ecea354b5e84fbdbf9936389b62eba33db SHA-256: 50c105fcc42bd822b4b8537d489adbfe7fd542b113f96f6ad1702cf39f8320d3
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verification-or-surveys-game-hack, is specifically flagged as malicious infrastructure. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of malicious links and the lure strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

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/how-to-get-free-robux-without-verification-or-surveys-game-hack In PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/pubg-uc-carding-website_GM1330123889.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-roblox-cards-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/cheat-codes-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/roblox-elemental-battlegrounds-cheats_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/how-to-hack-money-systems-on-roblox-tycoons_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/growbux-free-robux_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • https://klp.com.tr/inc/uploads/userfiles/files/adopt-me-roblox-free-money_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_off000032b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B0 22664 bytes
SHA-256: 1a59637080c08b36d3c037c5d92dbf8460ef3b9fc463a6819245be60bbafc28f
font_01_sfnt_off00006550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6550 19896 bytes
SHA-256: 37ec9b5a97e8c3032495185d82b71575b2e243d7fb6a4ee911979a924adec98e