Malicious PDF — malware analysis report

Static analysis result for SHA-256 191afd9860d379df…

MALICIOUS

PDF

31.2 KB Created: 2021-05-25 11:37:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b135968b4e55dd92b6bd8f9dacd0bb76 SHA-1: 3aa301175bdfa464199dfb8a6967ddab5535719c SHA-256: 191afd9860d379df10ead9371bee62bdd4c54e503eda805dfb6ec789de511f8f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector leading to a 'free Robux script game hack' lure. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9401

Heuristics 3

  • 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.
  • 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-script-game-hack In PDF document text
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://knowledgekingdom.com.jo/aidata/blanc/files/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • https://knowledgekingdom.com.jo/aidata/blanc/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-free-robux-without-doing-anything-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_off00003434.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3434 25152 bytes
SHA-256: 4392ccf3f032f12c809d36bd879535c230b6380213fadc67b7d6bc6e39dde081
font_01_sfnt_off00006ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EBC 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf

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