Malicious PDF — malware analysis report

Static analysis result for SHA-256 91711c891933880a…

MALICIOUS

PDF

50.8 KB Created: 2021-05-14 18:35:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 69a272d75b299f210fcd1c1640f42977 SHA-1: 8382a2cbd8894fc29b0d4a58de725e18ebfdb9b5 SHA-256: 91711c891933880a3774365a51f80f39b0bf2bd6664b8190b52da67a0e6ec1cb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious infrastructure, specifically advertising a 'Coin Master Free Coins Game Hack'. The document body and numerous extracted URLs reinforce this theme, suggesting a phishing or scam attempt to lure users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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/406889139/coin-master-free-coins-game-hack In PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://distribuidorademoveis.com.br/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.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_003_off00004c1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C1B 26320 bytes
SHA-256: 79ca44532af0a8d56d42dc65db3fe0a7d417c43a143e993aaa2f833c96bfce5f
font_01_sfnt_off000087b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B4 2824 bytes
SHA-256: 381f6d859be141449dd645f7be1484d2a1cf49218dc471b402dae69eaa2b11d5
font_02_sfnt_off00009152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000a5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DC 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e