Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f571db1ab4d5c3…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 23:11:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0a0fbb95fb1efc04075a612e72107d34 SHA-1: 9580381bba94f4611f6edc43b808c4142ee088d3 SHA-256: 38f571db1ab4d5c3986870db4e232ff63b0509328f1ca41f32c59ec153b71602
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links, including one to a known malicious redirector at http://netcdn.tw/app/431946152/rblx-city-free-robux-game-hack. The document body and heuristics indicate a lure for game hacks and free in-game currency, suggesting a phishing or scam campaign. The presence of many external PDF links further supports the idea of a link farm designed to distribute malicious content.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/rblx-city-free-robux-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/pokemon-go-free-xp_GM1094591345.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-adopt-me-free-fly-potion_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/mcpe-master-hack-coin-apk_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-tower-battles-credits-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-robux-hack-download-link_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-item-roblox-hack_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_off0000309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309C 21724 bytes
SHA-256: ff4a8634efadebcc1860d555dfe4b0848946bd01aaf9e4034499bac23dc0b052
font_01_sfnt_off000060ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AD 19196 bytes
SHA-256: f2f3397c6c781d56e9789bf5c46018266820e8d927479f7a86dfea2d7904bf30

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