Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f71642ab70710ac…

MALICIOUS

PDF

43.0 KB Created: 2021-05-10 16:14:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 901a12550f59e8ed38e9172d57472ca1 SHA-1: fc0e8b5daf9e71365cf92772b070cf80e7c1ab0b SHA-256: 0f71642ab70710ac08d6239d862cd6494c09fc836eb5f995c4197068bdfe65d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free Robux' and 'game hacks'. The document body and embedded links strongly suggest a social engineering lure designed to lead users to potentially malicious websites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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/free-robux-websites-2021-game-hack In PDF document text
    • http://www.buapit.ac.th/UserFiles/File/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-minecraft-java-code_GM479516143.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_off0000462b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x462B 26944 bytes
SHA-256: d9bfb32cc619124c37521df971ea7fe53c0353568e5ad330ba4b6537afa5a0a1
font_01_sfnt_off00008411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8411 18836 bytes
SHA-256: ef44fc6ccc8558fc54da3394cf76e38d99de94399ef86c3bb36f5b939f331685

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