Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e7f82d8822a768…

MALICIOUS

PDF

43.3 KB Created: 2021-05-15 01:42:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7560256647d013b0812128c165181918 SHA-1: 598d92ccf9433367f487c3b26eaefa9f6c122ed3 SHA-256: 16e7f82d8822a76865a24d86571567b0b75304819467af31422aa4a1ad693266
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that claim to offer free game hacks and currency, such as 'Claimrbx Free Robux'. These links are flagged as malicious redirectors. The document's primary function appears to be directing users to these potentially harmful sites, which is a common tactic for phishing or scam operations. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/431946152/claimrbx-free-robux-game-hack In PDF document text
    • https://amiranet.com.br/files/files/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/coin-master-apk-hack-mod-download_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://amiranet.com.br/files/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://amiranet.com.br/files/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://amiranet.com.br/files/files/free-draw-roblox_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_003_off00004bee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BEE 27604 bytes
SHA-256: 8d2b6dbd8a4c362834220331ec5ab30328919d987bd5ed4688ec7b65fbcb6288
font_01_sfnt_off00008a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A41 18696 bytes
SHA-256: cfa2fb642045145230a20b139508f2677ace4dfe3e3be0c8823c50af7163445a