Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec98a6a660299ca2…

MALICIOUS

PDF

42.2 KB Created: 2021-05-20 01:30:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7923736afd8116fa70a27794d169aeac SHA-1: aa2bb9b5269deee8893c34382a20774d4b04201a SHA-256: ec98a6a660299ca24357f581aed1bb5a9209281afdece6afebd358fd833728ee
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to known malicious redirectors, specifically advertising 'free generator' or 'game hack' lures. The document body, though partially obfuscated, reinforces this theme with text related to free Robux and game hacks. The presence of these lures and the ML classifier's high confidence score indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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/431946152/free-robux-no-human-verify-game-hack In PDF document text
    • https://www.polyfin.de/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-roblox-app_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/roblox-c9m_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.polyfin.de/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.polyfin.de/images/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://www.polyfin.de/images/rbxoffers-earn-free-robux_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_off00004864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4864 24632 bytes
SHA-256: 6424379ebf2da66d572968c71136658416844b66d52beb738588bbf4fde8b3c4
font_01_sfnt_off000080ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80AC 18936 bytes
SHA-256: 1a7af96eb5386f0345b1dbf35dc45129c86900916c4bfc8bfbf0065f0a01c751

Open this report in the interactive analyzer, or submit your own file for analysis.