Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4ab6fd1776ed96…

MALICIOUS

PDF

36.7 KB Created: 2021-05-10 10:48:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bb085660eac12e5318737bc63779d10c SHA-1: 74f883c131972c0774f6d830ed950035c775e165 SHA-256: 3f4ab6fd1776ed96fea32fe4393ebd5a1addeae1e0c736f868eb624bfd778323
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'coin master free spins daily game hack' lure. The document body also contains similar text and a call-to-action phrase, reinforcing the social engineering aspect. The embedded URL is known to lead to malicious infrastructure, likely serving as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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/406889139/coin-master-free-spins-daily-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_off00003456.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3456 25524 bytes
SHA-256: 8c872bb71f2e5280cc33a54335f92965ad8b74e4d701de1630a85794a94c7d52
font_01_sfnt_off00006e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E38 18308 bytes
SHA-256: 220bb6194b1ab8a2bb399ca4a862914ac8d15b354bb0df2c737bc67699221dc9

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