Malicious PDF — malware analysis report

Static analysis result for SHA-256 99522fcec84bf9c9…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 02:24:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7b613476dc76303cac82eb71a014478c SHA-1: 0a51e5440f1135b8658c766b5b74752a6739ed96 SHA-256: 99522fcec84bf9c95dadfc195ee9d0568ea83ad8603ce065f123eb55e7b0e743
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free game currency or hacks. The primary lure URL is http://netcdn.tw/app/431946152/how-to-get-free-robux-fast-and-easy-game-hack. This indicates a social engineering tactic to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

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-fast-and-easy-game-hack In PDF document text
    • https://yc-certify.com.tw/image/data/files/pubg-uc-via-easypaisa_GM1330123889.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-roblox-cards-codes-2021_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-wings-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/roblox-timoty-hacks_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/instantrobux_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-roblox-shirts-girl_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-images_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-no-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://yc-certify.com.tw/image/data/files/free-robux-today_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_off00002fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FCF 22460 bytes
SHA-256: af1263e14041f09359d6203348377140bc42bbef0247f9d343584cc231832433
font_01_sfnt_off000061b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B5 19340 bytes
SHA-256: e9e0cf1ab6f783e57183aba6e7ab34e8b0edef29a09b47d1de428d0435b690df

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