Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c951f8fdbff10e…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 20:54:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ffe4b053aaca89e3d2fc9f95df2b6a2d SHA-1: aa326a7b44536a24f8484bb9a692bda8f28c8aed SHA-256: 28c951f8fdbff10eddbb7d9257c8c77fc65f4350529217fcdce155f2626516b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically advertising 'game hacks' and 'generators'. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-spin-link-game-hack. This pattern suggests a phishing or scam attempt designed to trick users into visiting potentially harmful sites.

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/coin-master-spin-link-game-hack In PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-furniture-for-free-on-roblox-highschool_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-hack-2021-mega_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/robuxian-com-free-robux-code_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-games-and-free-roblox-for-kids-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/coin-master-free-spin-daily-bonus_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/robux-offer-wall_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_off00003262.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3262 23192 bytes
SHA-256: 20021aff7dcfbfffee932b2594bbff54e1a6a525ccfb3a08badccac24fc91913
font_01_sfnt_off000066a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A0 18180 bytes
SHA-256: 6f1c3345af99086e4401991befec5a43a6ea280f4df42811c95578481334f0e1

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