Malicious PDF — malware analysis report

Static analysis result for SHA-256 81483973444c12c3…

MALICIOUS

PDF

35.0 KB Created: 2021-07-08 05:11:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ca4b8fc1542378739a18f495731a161d SHA-1: 4eb4da16db782c02ee247179c0bc00d4a8e43666 SHA-256: 81483973444c12c3bc0fb88e411fe281ec79798c20704059b9167eaef653334b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a known malicious redirector, disguised as a 'free generator' or 'game hack'. The document body and embedded URLs strongly suggest a lure for users seeking in-game currency or cheats, which is a common social engineering tactic. The ML classifier also flagged this PDF as malicious with high confidence.

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/game-give-free-robux-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/hack-admin-roblox-weaponds-giver_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-emotes-free-link_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/get-your-free-tvs-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/gift-card-generator-hack-robux-codes_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/inf-currency-in-roblox-games-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roblox-accounts-with-premium_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/youtube-inquisitormaster-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-roblox-accounts-list-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-free-robux-deutsch-pc_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_off000030e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E9 22564 bytes
SHA-256: 5d0ba0fed3eee876c990c2a8b471567769a63c27245cbe2f5935311124ef0b4f
font_01_sfnt_off00006346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 19208 bytes
SHA-256: 69813dd6a6bd245aee50b944f0193d6275a7494d00db293a689fcf826d12d1cb

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