Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ff535e1ce91b5c…

MALICIOUS

PDF

41.0 KB Created: 2021-05-10 17:02:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: ff308cf65bf053a653c4ae6d7526b3f1 SHA-1: b9f950c24d1a0c688b6fbc2a4e9d2bd39f975496 SHA-256: 20ff535e1ce91b5c2131aaf4631cc2947253ea079cbbb22aa162fd3f39c98f47
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free spins' for popular games. 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 websites that may host further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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-spins-2021--game-hack In PDF document text
    • https://kalendarite.eu/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-money-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-2021_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_003_off00004465.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4465 25148 bytes
SHA-256: 1c934639065ab7bad8bcff6afde8f5120e875e791ee08e3375cb8b26800deba7
font_01_sfnt_off00007e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E25 18288 bytes
SHA-256: 9f7609fba99e53c6baa99bb04d1c7e3f9b7167131c1520eb2a413cdab4a14871

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