Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b4193d735a1489…

MALICIOUS

PDF

51.0 KB Created: 2021-06-03 09:39:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b8c7ee05930cc1c45b95417cbea1e0e5 SHA-1: 3cf89df29098eed6e0e44286d8c43dd6dbbdcd03 SHA-256: 42b4193d735a14899468f185efb8ea12255173fb870409c4495150c8cfb0c403
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as 'free generator' or 'game hack' lures. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The primary function appears to be redirecting users to potentially malicious sites that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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.online/app/479516143/free-minecraft-generator-game-hack In PDF document text
    • http://suaedy-library.net/repository/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-free-pin_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-pe_GM479516143.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/roblox-redeem_GM431946152.pdfIn PDF document text
    • http://suaedy-library.net/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000554a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x554A 26244 bytes
SHA-256: 9b0c33fd609216579efb0fb40ea5ef28a5804afc798358402124dcf8b7dada50
font_01_sfnt_off0000914d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914D 3136 bytes
SHA-256: 85d4d5a4d6336e43e70f21e51077abfa60171ca87b4a405684da76030a579546
font_02_sfnt_off00009c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C0F 2816 bytes
SHA-256: 4555740682277f0055d57b15bd0ba953e5b51415ea3d21c93db391eace072d4f
font_03_sfnt_off0000a620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA620 17712 bytes
SHA-256: 2ba423467bb34654934421079a82fe93ae3f0cf8ad50d4b3792d5c3eca35bf12

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