Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f889744e44e4f5…

MALICIOUS

PDF

35.8 KB Created: 2021-05-11 08:53:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 00ec8e1a6ca13d2856226cfb65427479 SHA-1: dbc26c653b564c5529bef1f1144630c7ea4ffcd1 SHA-256: 88f889744e44e4f5559838a70f043f8ec3aa9131bae97a3a94f7c4779ffc4ef6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that point to a known malicious redirector infrastructure, specifically advertising 'Coin Master Free Chest Link' and a generator hack. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of the URL. The document body also contains text and links related to this lure, suggesting a phishing or scam attempt designed to trick users into visiting the malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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-chest-link-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_off000032c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32C6 25132 bytes
SHA-256: 241eb1a8462ab2408c8a5f6301aa06d75fade815246e14b8431c132cce7e0581
font_01_sfnt_off00006b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B47 18048 bytes
SHA-256: 122f27be2a08f4c3092db92943aab7c4ba84ce785d8466f49daf08684c118ae5

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