Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa8fdbd74f1f644…

MALICIOUS

PDF

36.9 KB Created: 2021-05-10 12:07:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: acb2a648074021bf03de48ff566b07e8 SHA-1: 5071823491188717dee59596aad96f60a5a5f079 SHA-256: 4fa8fdbd74f1f6442d3589a99d5d13ea7a153f3b96f49a0fe8148ecee91a2c44
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'free spins' and 'game hacks', directing users to a known malicious redirector URL. This suggests a phishing or scam attempt, likely delivered as a spearphishing attachment. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/get-free-spins-coin-master-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_003_off000034d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34D2 25244 bytes
SHA-256: 12cb3fbbd28d6714a7bfc3dbec69e9cfd0260f3aa86f58f8382b712a3e503474
font_01_sfnt_off00006ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC4 18288 bytes
SHA-256: b38ddf3080d7f2bc752da259c3b03eae0df146b085052c6419baf797dcf0dadb

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