Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa175a79be2a3c89…

MALICIOUS

PDF

33.5 KB Created: 2021-07-09 18:08:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e044b98b92309b1a8693e68c60e0e736 SHA-1: 8fea0c21bc02978d30ee2c8643e5912ed045425a SHA-256: aa175a79be2a3c89e48ee5cdbc6c7e2799956eff7bc2eafe044202620d150519
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure related to game hacks and generators, directing users to a known malicious redirector. The document body contains multiple URLs, including the primary malicious redirector and numerous other links to potentially malicious PDF files hosted on the same domain. The ML classifier strongly flagged this PDF as malicious, and heuristic rules indicate it links to known malicious redirector infrastructure.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/479516143/minecraft-115-2-hacks-game-hack In PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-critical-strike-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/body-roblox_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-comrobloxplay-now-for-free_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/pokemon-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/client-minecraft_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/how-do-you-get-free-robux-on-a-computer_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/minecraft-wurst_GM479516143.pdfIn PDF document text
    • http://www.nelsonssales.com/media/storage/editor/files/roblox-elemental-cheat-engine_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_off000030fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30FC 21608 bytes
SHA-256: 3e85354f70fd8ef6a516c0088f2db7924c40d73602ed4020ee310a13132f614b
font_01_sfnt_off00005fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FED 18392 bytes
SHA-256: a5e8b6de27b32cfbe788615902c7a1c8c983a8dcd969aa9e6686e527b322186c

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