Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d0d19651664ee3…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 16:10:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 000f15b7e250142a0b8c1b22acab1ae0 SHA-1: 9d08ebe41d3c60bc5c786e61d58cce1236d21b15 SHA-256: 21d0d19651664ee300fe97161ffcbe2e0241312e88d45608e299c5a140b281aa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'game hacks' and 'generators' for popular games. The ML classifier also flagged this PDF as malicious. The presence of embedded URLs and the nature of the lures suggest an attempt to direct users to potentially harmful websites, likely for malware distribution or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/roblox-people-girl-game-hack In PDF document text
    • http://loszavera.com/images/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://loszavera.com/images/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://loszavera.com/images/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • http://loszavera.com/images/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/how-to-robux_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://loszavera.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://loszavera.com/images/my-roblox-account-was-hacked_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
stream_003_off00004847.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4847 24996 bytes
SHA-256: f5f429fd25d0575b292018d0b0e5d950225b0c26694b86b809ff85bf30622cc2
font_01_sfnt_off00008226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8226 18232 bytes
SHA-256: 2c4b1e54e23ec6bbd5623f0337a8cca6ae55b6d4ff98ea4cc147b37d00c51703

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