Malicious PDF — malware analysis report

Static analysis result for SHA-256 c644997a80ffe280…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 13:41:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 855542f3ca2a8f2101efbd60d35d0897 SHA-1: 51932f8a71dc86916e460230413f51748b40357e SHA-256: c644997a80ffe280a46198a5f8cafab37dea1040dc1717ddcb8fe7d8374cceb7
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/431946152/roblox-prison-life-hack-game-hack. These links, combined with the document body's lure of 'Roblox Prison Life Hack' and 'Free Robux Generator', strongly suggest a phishing or malware distribution attempt. The presence of embedded URLs and a visual download button further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/roblox-prison-life-hack-game-hack In PDF document text
    • http://183.91.70.7//repository/minecraft-116-1-download_GM479516143.pdfPDF link annotation
    • http://183.91.70.7//repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/earn-roblox_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://183.91.70.7//repository/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://183.91.70.7//repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://183.91.70.7/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/near-pubg-uc-code_GM1330123889.pdfIn PDF document text
    • http://183.91.70.7/repository/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://183.91.70.7//repository/tiktok-free-key_GM835599320.pdfIn PDF document text
    • http://183.91.70.7/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://183.91.70.7/repository/free-spin-codes-coin-master_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_off00002d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D64 22684 bytes
SHA-256: 2db344b9d3f7327ecb3e59902946d5fce95ab8d79b49551574620253ce4d42a7
font_01_sfnt_off00005fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEC 18932 bytes
SHA-256: 757c592a10e4627f90624bfdd8f1127ea4c0f8f917493ad00ff1bc4f9e7f3eb7