Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb92b46753a6297…

MALICIOUS

PDF

35.2 KB Created: 2021-07-01 10:03:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 128ceb53f5ecbe9d0d7b29bbe1844c59 SHA-1: 9531ca2781a2b2c6a517cecfe2e4788ec0be7088 SHA-256: 8eb92b46753a629753771387fbb7e93e57517167f732dea355e50326372d4f04
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 and hacks. The primary lure URL is http://netcdn.co/app/431946152/free-obc-roblox-accounts-2021-game-hack, which is flagged as a malicious redirector. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

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.co/app/431946152/free-obc-roblox-accounts-2021-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-robux-hack-links_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-u-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-granny-cheats_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-executor-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-robux-free-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-how-to-get-free-admin-on-any-game_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-daily-free-spins-2021_GM406889139.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_off00003261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3261 22212 bytes
SHA-256: 99a1c89bc55eebfe2fd30696aeb966e34ca06a5de987186804588a87d8246b3f
font_01_sfnt_off000063b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 19296 bytes
SHA-256: 92cea782c75c600dda6290da2c3295614480e1bd2c2c4c43671ce6c8a508ffb2

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