Malicious PDF — malware analysis report

Static analysis result for SHA-256 11536d1bcebd65e1…

MALICIOUS

PDF

35.6 KB Created: 2021-05-21 11:02:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4442e2e933edd8560f2118d194b1f994 SHA-1: 3e60519a792310455fda4e6477011efeac65f779 SHA-256: 11536d1bcebd65e1af7dc1bc92926d401e1a775e5b7cced227574f77e6878dc3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a prominent link that is identified as a malicious redirector, masquerading as a 'free generator / game hack'. This link directs users to a website offering 'free Roblox accounts with Robux'. The presence of a download button lure further supports the malicious intent of tricking users into clicking through to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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-roblox-accounts-with-robux-that-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_002_off00002d5a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D5A 25408 bytes
SHA-256: 81871713102fdf9c9280a4d5c87c007c5d21161fcb8a9b5c6207e65692dd49b1
font_01_sfnt_off000066b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B8 19476 bytes
SHA-256: 4c7cb67921980cc467a624d7be0aa4f8f19dcdcb8d4cb789adc94de6f70366aa

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