Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4660e242fd9f0fc…

MALICIOUS

PDF

36.8 KB Created: 2021-07-09 17:42:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0fb36d4168d3f958118d92eca4013aa7 SHA-1: f8161bb9cca6e5fc31faa26e8aeee5f32ba75b58 SHA-256: a4660e242fd9f0fc08170eebd29fb743f8302b810047e799d58b63058d617147
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to websites that are flagged as malicious redirectors, specifically promoting game hacks and generators. The document body and embedded links suggest a lure to trick users into visiting these sites, which likely serve as a gateway to further malicious content or exploits. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a malicious intent to redirect users to potentially harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spin-and-coins-links-2021-game-hack In PDF document text
    • http://educhina.mn/editor/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-free-download-meepcity_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/hacks-for-roblox-couner-bloc_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-hacks-on-computer-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-builders-club-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/meme-attack-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/can-you-earn-robux_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_002_off000033b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33B6 24376 bytes
SHA-256: 7fd31449186f032ed69cae7bdb5ee6d9af397cdffa72341027c3e0e7633bb838
font_01_sfnt_off00006b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5D 18920 bytes
SHA-256: 6400190eeb2151d5e1f5614a198f46375c96aba5f11acfeaff13e592fb093653

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