Malicious PDF — malware analysis report

Static analysis result for SHA-256 57798efd704fbe19…

MALICIOUS

PDF

46.5 KB Created: 2021-05-10 22:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cb0b1000db91768912759a296ddf029f SHA-1: f320003b649ab2f7a1208c62c1468978a3824a40 SHA-256: 57798efd704fbe1919308888a210230b91e9cf25debab64bff0d097b5636e566
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting "game hacks" and "free spins" to lure users. The primary malicious URL identified is https://netcdn.xyz/app/406889139/daily-coin-master-free-spin-link-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious redirector workflow, likely leveraging embedded JavaScript for obfuscation or redirection, hence the T1059.007 technique. The overall goal appears to be social engineering users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/daily-coin-master-free-spin-link-game-hack In PDF document text
    • https://www.taline.hr/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.taline.hr/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/minecraft-windows-10-free-trial_GM479516143.pdfIn PDF document text
    • https://www.taline.hr/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.taline.hr/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.taline.hr/files/minecraft-free-ios-2021_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48E5 27020 bytes
SHA-256: 334942922057057665a57559b6480ec14abd86ef84cbd1ceb94007cf1dd83de7
font_01_sfnt_off000086d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D8 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off000092c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C0 18476 bytes
SHA-256: 0e8ff706f766ebeac8fd51df3b46864e48e50accc558ba14dc70aa8347bf43ac

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