Malicious PDF — malware analysis report

Static analysis result for SHA-256 133b8e563f917886…

MALICIOUS

PDF

35.3 KB Created: 2021-06-27 05:21:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2c0eb85406e5028b506d6a5aed06735d SHA-1: c55274a80689cf91b0b10b4ee86b2a879fce676d SHA-256: 133b8e563f917886acb29f81341a3cb7524c78837d60415fc4e0ca6de5c507b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and scam-related content, specifically targeting users interested in game hacks and free in-game currency. The primary lure is 'Enter The Code To Get Free Robux', directing users to a suspicious URL. While no scripts were extracted, the embedded URLs and heuristic firings strongly indicate a phishing or scam attempt designed to lead users to potentially malicious websites.

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/enter-the-code-to-get-free-robux-game-hack In PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-cheat-for-infinite-oney-on-mining-simulator_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/robux-plus-live-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-robux-com-hack_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/quick-robux-hacks_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/minecraft-items_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/hack-avatar_GM431946152.pdfIn PDF document text
    • http://www.callong.cn/uploaded_files/userfiles/files/roblox-games-to-play-for-free_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_off000031e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E7 22892 bytes
SHA-256: 10e0f0f52b1c2ec192ec0e1b299c83b4c5e87bf7eff36a2ba4da4af3152c25a0
font_01_sfnt_off000064da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64DA 19160 bytes
SHA-256: d3252ba54b21d6247d0f55a2ac4c70337eb33505696cf1f8fcb5666b82adf3de

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