Malicious PDF — malware analysis report

Static analysis result for SHA-256 f743f7f3a4c5d0c7…

MALICIOUS

PDF

35.8 KB Created: 2021-07-07 21:30:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4601e5fcc850ddb6812998c1f5ebacba SHA-1: fd3b1771e1ed459399d26cd24c47146f4a83c51a SHA-256: f743f7f3a4c5d0c708c661cb9117833b5df5e2d73707662cdff322f2c0821ff0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/431946152/get-free-robux-without-human-verification-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, likely intended to lead users to a phishing or malware download site. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/get-free-robux-without-human-verification-game-hack In PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-computer-hack_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-website-2021_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-give-yourself-money-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-generator-today-only_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-no-mobile-number_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-blood-moon-tycoon-auto-rebirth-hack_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-roblox-money_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_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_off000031fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FB 22748 bytes
SHA-256: af7c614acce12391c524d59666e1e6784f73c71d2dc55d27077b3c536204af37
font_01_sfnt_off00006544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6544 19700 bytes
SHA-256: e8bf7ca05401f798ebc0703cbcc09d220ccc7d22796280ca6a3dd60c700d0f91

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