Malicious PDF — malware analysis report

Static analysis result for SHA-256 026b3ed83cc5b2ad…

MALICIOUS

PDF

39.3 KB Created: 2021-05-11 15:46:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c18a5c672dec57e882cd5137ee90ef86 SHA-1: 374e2b95bc71c2000b6d784e1cb712c62aabed91 SHA-256: 026b3ed83cc5b2ad3f1ccd4b0b071efda065c12afc0c43f84ff7f9b3e3cfbb74
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux' and a call to action to download a generator. It embeds a link that redirects to a known malicious domain, indicating a phishing or scam attempt. The document body and heuristics confirm the malicious redirector and the lure, suggesting an attempt to drive users to a malicious site.

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/free-robux-websites-that-actually-work-2021-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_off00003425.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3425 28572 bytes
SHA-256: da87d50e40b1f7db548c807e6c45485949be0f59839afc92546dbd827c3a931f
font_01_sfnt_off00007434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 19656 bytes
SHA-256: 7b3ca8e33f6ab65cae0b12a773bae5d0e0377a7b1030ef9ec14be3c3cdd71d54

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