Malicious PDF — malware analysis report

Static analysis result for SHA-256 d607fb7fec9977c3…

MALICIOUS

PDF

33.8 KB Created: 2021-07-09 01:06:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6e16d8ee963f336a573f4a502b42d7c8 SHA-1: d41d9080c8e5b3065cf252662f360daa1ceec629 SHA-256: d607fb7fec9977c3cc18185ecfe3e7f0bb2d99690e0439a777c592150c7c5d2c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game-related cheat sites, indicating a phishing or scam attempt. The presence of embedded URLs and a lure for a 'download' button suggests the document is designed to trick users into visiting these sites. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence point towards a malicious intent to redirect users to potentially harmful content.

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/robux-xyz-game-hack In PDF document text
    • https://tena-g.hr/files/paste-hack-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-hack-music_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-cheat-codes-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-tix-in-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/mcpe-116_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/hack-roblox-admin-tool_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/krnl-roblox_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_off00002c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9D 22820 bytes
SHA-256: 374b017e3665d56d4a845528755c044dc2d5bb5d8970977da1eaf8ef0d81cd26
font_01_sfnt_off00005fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB8 18812 bytes
SHA-256: a516f3e7f8dc83c367f33f0d8cfe6a6678ee88d16001d3181d02ecb274fbad2b

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