Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a55cc4a278a0d8a…

MALICIOUS

PDF

37.7 KB Created: 2021-05-18 04:30:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8a4d773be73872efc4a5ce7af289e51b SHA-1: c85304630d6cb5afa7942d22ca77659bb047ac41 SHA-256: 1a55cc4a278a0d8acfd390e018d5b41a4a701d85c9c088618140ec358da67bcc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a lure for free game currency, specifically 'Free Robux'. It embeds a link to a known malicious redirector, https://netcdn.xyz/app/431946152/free-robux-that-actually-works-2021-game-hack, which is likely intended to lead the user to a phishing or malware download site. The document body also contains similar text and a call-to-action phrase.

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-that-actually-works-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_off000033f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F0 25268 bytes
SHA-256: e7e31c76a7d918c81c249d515163e686e1e21c6676ee4c7bf462b4c3fb04ade1
font_01_sfnt_off00006e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E55 19536 bytes
SHA-256: e162f10ab45425f1911b766a767f4688be22e04cba15be94f938466a51fc2df0

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