Malicious PDF — malware analysis report

Static analysis result for SHA-256 40da1c000f1aebe4…

MALICIOUS

PDF

30.9 KB Created: 2021-07-19 07:21:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4443c0716626d1efdb7df19073f13e24 SHA-1: 83ae80a79ff1603af3ac414bf87f0a182aedacde SHA-256: 40da1c000f1aebe47e4644b54eca40d47339c937d1a7ab23e1a83c19ef54e1a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, disguised as a lure for free college textbooks and TikTok game hacks. The heuristic firings indicate the PDF is designed to redirect users to potentially harmful content, and the ML classifier strongly suggests malicious intent. No scripts were extracted, but the embedded links are the primary vector for this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8477

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/835599320/free-college-textbooks-tiktok-game-hack In PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • https://hunting.beta.privatewaterfishing.com/userFiles/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://hackernoon.com/tiktok-free-fansIn 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_off0000234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234F 23208 bytes
SHA-256: f609a0207c697441881956f27e8eea308defe10dc83d957410ea18909d3b20cb
font_01_sfnt_off00005744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5744 18184 bytes
SHA-256: c51aa8ed87b8ee8755a1ecd789814fb67703fc10c946440f5ae6e88abb0f8eda

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