Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3f73d7dbda822a…

MALICIOUS

PDF

33.7 KB Created: 2021-07-07 21:09:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f3d013dc4bc854be6a746423c5d7f1a2 SHA-1: d6ff8d350be9a6de5fce470b7aa2001daf7c0e0a SHA-256: 3c3f73d7dbda822aaa9b07145894975a6a44bf9318393f5582271d45b17dd4db
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as "free generators" or "hacks" for popular games. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it uses a lure to trick users into clicking these links. The primary URL identified is http://netcdn.tw/app/431946152/robux-game-com-game-hack, which likely serves as the initial stage for a download or further redirection.

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/robux-game-com-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/sex-hack-link-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-dot-truck-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-com_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-hack-dll-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/tiktok-free-auto-hearts_GM835599320.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-free-codees-legit_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/offers-for-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-chaotic-neutral-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-coin-app_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/i-got-hacked-what-do-i-do-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-copy-right-free-codes_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-injector-pc-free_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-free-money-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/if-you-buy-this-you-can-hack-on-roblox-jailbreak_GM431946152.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_off00002e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E74 22112 bytes
SHA-256: dad9dc1f2f7ebdedaa73df1ef60cd96250283ace706d35892808ce3a2c902769
font_01_sfnt_off00005f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 18812 bytes
SHA-256: 184f0dd2eae8becf0c01250fb4d51c2c32cb4eda49217c2e7ddccebd1d6c8e21

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