Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b644ee2ef5850c…

MALICIOUS

PDF

29.0 KB Created: 2021-07-20 01:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7b855a454e91ef1674d8c831da2f77f3 SHA-1: 1e91702f3fa508581bdb75646c2782e47ea90f07 SHA-256: 35b644ee2ef5850cf45e89f88dc7dd315e4d49883167f4f132b4fbfa42df27e4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'free Robux game hack'. The document body, though partially corrupted, contains phrases like 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the lure. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0553

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 http://netcdn.tw/app/431946152/lazyblox-com-free-robux-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
font_00_sfnt_off00001ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC3 21400 bytes
SHA-256: e73cd2c3362f27ae261efda6327e5b2f0111437218e6f2e782db4eccd914eeb6
font_01_sfnt_off00004d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4B 19024 bytes
SHA-256: 526782f1ff70328694fc7e00be18e0e67c0f7dc586f16fbbfcee2cda038cc934

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