Malicious PDF — malware analysis report

Static analysis result for SHA-256 6887abf20df0faa4…

MALICIOUS

PDF

36.5 KB Created: 2021-07-07 03:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aadf372bd71bf8532b45c316f27b83dc SHA-1: 69361083c5f7acbe2c036942bb13eca4381a1601 SHA-256: 6887abf20df0faa4d5b1cceba2033cec62f2b7d3debf1e82f2d75e9b88848f23
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically promoting "game hacks" and "free Robux" to lure users. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-hack-without-verification-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to malicious sites, likely for further exploitation or phishing.

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-hack-without-verification-2021-game-hack In PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/app-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-10-free-robux-fpr-free_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/are-roblox-games-free_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/roblox-hack-clothes_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/roblox-jailbreak-hack-bypassed_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/delete-free-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-hack-a-roblox-account-2021_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_off0000351b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x351B 23320 bytes
SHA-256: 751f10fd05d356f9bc6af13dd5e967cfad69cf291dceb8ed0c1d23505333f22d
font_01_sfnt_off000069e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E7 19044 bytes
SHA-256: bc164ad6cfe60f57cf308bf587fcf39d6d442c5b14af35d4986789bcc521b71c

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