Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a65a0a833e0eff…

MALICIOUS

PDF

30.3 KB Created: 2021-07-20 06:20:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6861805bf83104263d6abdcd767d93cd SHA-1: 36cef439618db79878ae56fe74a4b400cf95a9bc SHA-256: 17a65a0a833e0eff6fd55c95b9c02f43ba6cd2fab36c11ee22ae7df63fe78cb4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically advertising a "Coin Master Spin Free" generator. The document body also contains a call-to-action phrase, reinforcing the lure. While no scripts were explicitly extracted, the nature of the embedded links and the lure suggest an attempt to redirect the user to a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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/406889139/coin-master-spin-free-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_off00002272.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2272 23020 bytes
SHA-256: bfb30a268a957939d2606897b28676925718787466e712a464203e1bb0ea1d37
font_01_sfnt_off00005618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5618 17884 bytes
SHA-256: f64f8d8cd546afe107dcd88d9ce91258665e3d619825ef5ba403a2abc0c27184

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