Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5b4c28fc572b7d…

MALICIOUS

PDF

36.1 KB Created: 2021-05-10 10:36:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c5755e032362032c158a0582d3916447 SHA-1: 6959292077c38eec22ec91974abfbe964c03c978 SHA-256: 5b5b4c28fc572b7d2811a81cc96d4c4c52b72bea417ef865173f96a031153f3a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a lure for game hacks and malicious redirectors, specifically pointing to the URL 'https://netcdn.xyz/app/406889139/coin-master-free-cards-link-2021-game-hack'. The document body also contains text and links related to 'Coin Master Free Cards Link 2021' and a call to action to download a generator, reinforcing the phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0283

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-cards-link-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_off00003189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3189 25664 bytes
SHA-256: 958d68985e86f89dbb63f61f8c6aa40e75bfe68c49de3ba3b31b813c256da8f6
font_01_sfnt_off00006b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 18456 bytes
SHA-256: b51790488d60a3c79421cfddad0a6ae9f074b26b8d27a704dda1d2d7bad48ec0

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