Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c44d5dc4f5f1eea…

MALICIOUS

PDF

42.2 KB Created: 2021-05-10 15:00:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 542c13d7f2f120f1b7b4c611f6c01dc4 SHA-1: 69336f36d1b9b342ed3dab9a508e31276e455707 SHA-256: 1c44d5dc4f5f1eea09206a7796a4602ff1933b0964042bf99f138ea9c5c7b8c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that redirect to a known malicious infrastructure, specifically advertising a "dailyrobux game hack". The presence of a visual download button and the document body text further reinforce the lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://netcdn.xyz/app/431946152/dailyrobux-game-hack In PDF document text
    • http://dismarinamt.com.br/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-client-download_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-cheat-client_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-hack-people-on-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_off00003b97.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3B97 31056 bytes
SHA-256: 0e1dc77c9866b12faf4bf9a684c161f96272b26204645dcec481d03bed4f1e1c
font_01_sfnt_off00008277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8277 18620 bytes
SHA-256: 006376ad9c7b73d4fd15d3b6dd3ffa9064f0af8ff6d6cdc29d45d1e9c8c3f0f5

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