Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fcd87fbeed0120…

MALICIOUS

PDF

41.5 KB Created: 2021-05-16 13:04:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f53100036d48c0a84ed47c4152b35889 SHA-1: d9629a53f432c80e22b24275a344c017a0524a92 SHA-256: f3fcd87fbeed012061027253ee180c5ef2657ac85ee2865b46115b1d95bf00ac
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a website advertising a "Robux Generator Without Human Verification". This is a common lure for phishing or malware distribution. The heuristic firings confirm the presence of malicious redirector links and a lure for a game hack. No scripts were extracted, but the document structure and embedded URLs indicate a phishing 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/robux-generator-without-human-verification-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_off000034ad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34AD 26936 bytes
SHA-256: 5e3c4eac087c9f71fbffd9f123702919d086d45408c094514be4eb55c5328215
font_01_sfnt_off0000714d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714D 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5E 19060 bytes
SHA-256: 0b726b9d6aa2dbbe5db30d67cab0ffdd1f5741338f472823ef6d39bdf2cbc11d

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