Malicious PDF — malware analysis report

Static analysis result for SHA-256 209bfaf21638d1dc…

MALICIOUS

PDF

41.9 KB Created: 2021-05-14 23:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ecc47371d599a7ea5635473363552581 SHA-1: f8f5058567b41902152b680cce858d3c1532ec39 SHA-256: 209bfaf21638d1dc0ffde4e84aee29b711348086e4d2395e2dd1e833ef3d14bb
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Roblox Robux Hack Generator" and embeds a link that redirects to known malicious infrastructure. This suggests an attempt to trick users into visiting a malicious site, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/roblox-robux-hack-generator-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_003_off0000355c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x355C 29128 bytes
SHA-256: 498f4c2fc7e6b53faa8d8f4042e664a9763f02cd1ee579a46965a9959f26f262
font_01_sfnt_off000077a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 2928 bytes
SHA-256: 4ac6997e1e67e0f6db5782458f29ed49154381a9c55bb0def8a7861581808b4d
font_02_sfnt_off000081c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 18428 bytes
SHA-256: bdac85b283ea9edec09d9f64e9cfc1f18bf7d6a92d05f58e23f3db2f02fbf028

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