Malicious PDF — malware analysis report

Static analysis result for SHA-256 205194f3e527193c…

MALICIOUS

PDF

42.6 KB Created: 2021-05-18 00:22:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f93ee0a6efef3a1d73f6ca3631111f62 SHA-1: ec03678dc0e2368d684585b1a51c497f6d029752 SHA-256: 205194f3e527193c2cf0f9d9697b328a30cde3feb98ce601ee19415db6aa6eb2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that are identified as malicious redirectors and part of a link farm. The primary lure appears to be related to game hacks and generators, specifically for Coin Master. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content or further stages of an attack. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-spin-link-game-hack In PDF document text
    • http://tc-kulmbach.de/images/games-for-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/hack-coin-master-ios-download_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-attack-hack_GM406889139.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_off00004b3f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3F 25656 bytes
SHA-256: f9540631a55d67fe28e067c088aecaad940b622661ef6077dbd8a4630998274d
font_01_sfnt_off0000853c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x853C 17892 bytes
SHA-256: 5eaa95033dd4e054ef8b2e0554ac351c032796849467c67c5432bd2ec705e461

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