Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd107d460527e707…

MALICIOUS

PDF

43.0 KB Created: 2021-06-06 23:41:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 980a803fa2f337c7a27db4439cff8e32 SHA-1: 5388d7e52646c99136603f67cbf4c3f509213771 SHA-256: bd107d460527e707e14ba3af4c3a3410f9e80239cda5f059b92fa15a2cf0fc51
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links and text that lure the user with the promise of 'Free Robux' and a 'Roblox Generator'. These links direct to a known malicious redirector infrastructure. The document body also contains text and a call-to-action button, reinforcing the phishing lure. No scripts were extracted, but the primary attack vector appears to be a social engineering lure leading to a malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0285

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.tw/app/431946152/free-robux-using-inspect-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00003a34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A34 26216 bytes
SHA-256: 1b3c33f55be788570928f38db264057b0aceab3f3ed18ef4c5f8ae3617ab05b2
font_01_sfnt_off00007677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7677 3924 bytes
SHA-256: b746ba3a57b90e08879572bbe7881df15a71c38b09470fbbade98a25a8f1731d
font_02_sfnt_off0000834c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834C 19288 bytes
SHA-256: 7664014de8ea9c8ec8afd97aea986950b101c9f70d914951716e0559252ae510

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