Malicious PDF — malware analysis report

Static analysis result for SHA-256 b391c38ef2019a1e…

MALICIOUS

PDF

27.0 KB Created: 2021-06-29 17:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 08f0b56df417d1d626def29595a8f1fe SHA-1: 98901452a055371667ec2b1813e60e4e05236638 SHA-256: b391c38ef2019a1e803ea93209fa6ca6bf9fa812bb4e15c76965049b01d6783a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to a known malicious infrastructure, disguised with a 'Roblox Hacking' and 'Robux Generator' lure. The heuristic findings indicate that the document is designed to trick users into clicking these links, which likely leads to a phishing page or a malware download. The presence of a call-to-action button further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0327

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.co/app/431946152/roblox-hacking-youtube-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_off00001501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501 21852 bytes
SHA-256: ad1884ade019ffbcddf4efe9ac19706050fe583ebb85d957467f13143ed1db52
font_01_sfnt_off00004571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4571 19184 bytes
SHA-256: 2897c5e9a1aa4c12d33d7e06196c6367c7d47505f09f0cd492822d4a7521f145

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