Malicious PDF — malware analysis report

Static analysis result for SHA-256 276548294562dfa3…

MALICIOUS

PDF

35.9 KB Created: 2021-07-01 07:36:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 42ae86528055e11f52bc046ca3b89149 SHA-1: 5bca4cecc0eda5fe76287022a7c96aae1cd98995 SHA-256: 276548294562dfa38aa2597c6b4c3f1ea7f3b173bc6ee8f86aaa45f611a50b0f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/406889139/coin-master-free-gold-cards-link-game-hack. This redirector is likely used to deliver a second-stage payload or lead users to phishing sites. The document body and embedded URLs reinforce the lure of game hacks and free currency, a common social engineering tactic. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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.co/app/406889139/coin-master-free-gold-cards-link-game-hack In PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/comment-hacker-roblox-version-anglaise_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/roblox-city-free_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-robux-no-password-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/would-you-get-banned-from-roblox-if-you-hacked_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-free-spins-and-coins-for-today_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/how-to-hack-in-cafe-v4-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/april-fools-hack-of-2021-roblox-wiki_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn-revalidation.co.uk/uploads/files/files/free-gamepasses-roblox-v3rm_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_002_off00003451.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3451 23500 bytes
SHA-256: a5ffa30bf473984e788d96d4e95fc9099f31b7e64087a75692e875d86ac0fb44
font_01_sfnt_off0000698f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 18416 bytes
SHA-256: 89113b1104d7a8f0ec89d4a785a1cf441d54076bb8a1f1cdfa29711bc1c2c75d

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