Malicious PDF — malware analysis report

Static analysis result for SHA-256 894eb06b0166e66c…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 23:35:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5d7a4fe889b5e2d718068112a11e44f5 SHA-1: 4745c30bff3ecc76c8aabc21dea7840b66467afd SHA-256: 894eb06b0166e66cb77092346f485760cb7c53ea5d188c3b496e3610563af1c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one to a known malicious redirector, that promise free in-game currency or hacks. The document body and heuristics indicate a lure for free Robux or similar game-related items. The primary malicious link is http://netcdn.tw/app/431946152/free-robux-group-game-hack, which is likely used to deliver a secondary 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/free-robux-group-game-hack In PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-roblox-accounts-2021-with-robux-bugmenot_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-music-id-break-free_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-minecraft-account-list_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-military-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-bee-swarm-simulator-hack_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/tiktok-free-views_GM835599320.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_off000031cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CB 22168 bytes
SHA-256: aa914d798e034f88a9251dc4f02b1b2a5a0c767e241d72e46c2394319fceff29
font_01_sfnt_off000062d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D4 18892 bytes
SHA-256: 67507f51078b9d360364fd80bede771b0831b8cadce387b59c9348d966d9fcb5

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