Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fe1c56ea10bdcf…

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 12:45:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 930c6dd0d2c4e191cdfabb657fdd3391 SHA-1: e6a34b5d22a67121fb4269150fcfcf929dc7d818 SHA-256: 78fe1c56ea10bdcfff40abd0f439dda014f34acde0972475312a289d711a818d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and lures users with fake CAPTCHA and download prompts, suggesting an attempt to trick users into downloading further malicious content or visiting phishing sites. The primary malicious URL identified is https://netcdn.xyz/app/406889139/free-links-coin-master-game-hack. No scripts were extracted, but the document's structure and embedded URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-links-coin-master-game-hack In PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-today_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/minecraft-font-free_GM479516143.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://tuyensinh.utc2.edu.vn/uploads/img/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46E8 25820 bytes
SHA-256: 9e82ca442821fdfb06e0d9b276a3185bd775aeec2f87892e77f8691c15bd0f2a
font_01_sfnt_off00008332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8332 3460 bytes
SHA-256: 27f6ee24b80a0c45a340e32027a43d6c3a7853aac96563eed14d58819399f6a8
font_02_sfnt_off00008e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9C 17880 bytes
SHA-256: c5130e18caf6f7222c4492e4e2e2fc6b4580e14129763dcab090a363ad6db2dc

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