Malicious PDF — malware analysis report

Static analysis result for SHA-256 555529c4ec757fe2…

MALICIOUS

PDF

41.6 KB Created: 2021-05-14 10:03:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b773e8b36f475c7feb9908d95cdae889 SHA-1: db65ad6f08d9b255216b9550a0c7f6d7f5247142 SHA-256: 555529c4ec757fe2582221450edbee042f11f2be67e33d3b4ad1e451cbb0cac2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically identified as a lure for game hacks and free currency. The ML classifier also flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing sites, indicating a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/cm-free-spins-and-coins-game-hack In PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/microsoft-store-robux_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/how-to-hack-coin-master-game-without-verification_GM406889139.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.harveenent.com/uploaded_files/userfiles/files/minecraft-hacked-client-bedrock_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_off00004b2f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B2F 23892 bytes
SHA-256: 139a5eee72b0ce8296214183fe46062e8c8fb6ffaf8b29b2caa288c98199ccae
font_01_sfnt_off0000817c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817C 17988 bytes
SHA-256: 6c27acc7e1a27f4dd98d9cdf7a00649578deada87f4d5bf77ad692372392325d

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