Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c292b737188705…

MALICIOUS

PDF

37.8 KB Created: 2021-05-10 11:04:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 159de7e8cc95284e31bd157fd2ddcac6 SHA-1: f4b4c55d3ddce5f17881292b51c8dea212442380 SHA-256: a0c292b737188705666634c81f9f8e17753fce2e072c5f8fc954308ff4f7c55e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a lure for a malicious redirector, specifically advertising a "Robux No Human Verification" generator. The embedded URL, https://netcdn.xyz/app/431946152/robux-no-human-verification-game-hack, is flagged as malicious. The document body also contains explicit calls to action and the malicious URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-no-human-verification-game-hack In 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_off0000363c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x363C 25428 bytes
SHA-256: 94c7d11e51d37ee997d056e1282c7d3e2f7397ba916437bf3ce77ca753582762
font_01_sfnt_off0000712a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x712A 18696 bytes
SHA-256: b0b7efb10b2be72ca1f11f5058a16b7f706f868f5fc2e7590f71e4c885e22b6d

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