Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eee0ab372121f8…

MALICIOUS

PDF

31.5 KB Created: 2021-07-19 04:01:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fac372f0a1c483327875e3a7aa6eb51a SHA-1: 5c2254813c0c61557f29675899a57400bf38bad1 SHA-256: 87eee0ab372121f849ea9859b91891af7ea3c343de69ea842f3c0822bcaf4d07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically promoting "free Robux" and "game hacks". The document body includes a prominent "CLICK HERE TO ACCESS ROBUX GENERATOR" call to action, reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead users to potentially harmful content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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/431946152/free-robux-accounts-game-hack In PDF document text
    • http://www.backlineservice.nl/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://www.backlineservice.nl/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.backlineservice.nl/images/how-to-hack-someones-roblox-account_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
font_00_sfnt_off0000291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291F 21836 bytes
SHA-256: 79e7311c3fc48431903ab2f4bd5b48adee67db2df091ad961c902d545d9fa9d3
font_01_sfnt_off00005900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5900 18304 bytes
SHA-256: c204acef3e551231e5c23dbfbb2d775467b579b40a97e419668be00c01df0aed