Malicious PDF — malware analysis report

Static analysis result for SHA-256 849a3103b053623e…

MALICIOUS

PDF

33.8 KB Created: 2021-07-23 15:51:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e4a1d7ac9d5fe6b2b542c12f35dec891 SHA-1: d5dedcb1c63c9e408862fc32f665fa9fd9673598 SHA-256: 849a3103b053623e5c773f73adae0903ac749107863ac01ac36cc3eb483623b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically a URL related to 'free Robux' generators. The document body and heuristics indicate a lure designed to trick users into clicking these links, which likely leads to further malicious content or exploits. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest an attempt to exploit users through social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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/how-to-get-free-robux-without-doing-anything-game-hack In PDF document text
    • https://inspiration-modellbau.de/images/coin-master-free_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-hack-into-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_off00002c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C60 22460 bytes
SHA-256: da8c2cfcb2fe9a0d3d7ac92b38f5122322a4f3468e20b1a0272fc5ee3cead943
font_01_sfnt_off00005e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E46 19588 bytes
SHA-256: 2076f8eb29aaa86a7e78e1b1305efdafa9ca7953bc640d1b72175bdc2a844af6

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