Malicious PDF — malware analysis report

Static analysis result for SHA-256 377c6d4c6085cbe9…

MALICIOUS

PDF

34.8 KB Created: 2021-07-09 19:12:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c88cbbbd6a2bec35bf879660e7702bd9 SHA-1: 37232714ffafc4cb6a7de8ca660184cebfa7c2b9 SHA-256: 377c6d4c6085cbe9b153e5a19198f7b475563b5986b9f3d81ba0a1aa9c11f5b7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and domains known to host malicious content, masquerading as game hacks and generators. The document body explicitly contains the primary redirect URL, suggesting an attempt to trick the user into downloading a second-stage payload. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or malware distribution attempt.

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/free-spin-coin-master-link-today-game-hack In PDF document text
    • http://croatia-flyfishing.com/files/calu-hack-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/hack-download-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-actually-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/how-to-get-free-robux-items-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/spin-link_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/face-png-roblox-free-face-q-se-queda-para-siempre_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-no-human-verification-no-scam_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fdd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FDD 23072 bytes
SHA-256: e804cb917048b1bd80681a74713163ab4f6c72c210b9a10e733f036f5ff6c13f
font_01_sfnt_off000063da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DA 18696 bytes
SHA-256: 999ecdd706d19f0427b49ef661b374c0ed01ce3167435dc1c975e4b6691a93c3

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