Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b5ffac14bf570e…

MALICIOUS

PDF

36.8 KB Created: 2021-05-15 15:30:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ba70540fe0480202cff5ee5be0388dcc SHA-1: 18fd59c3b9dd3dd102a76ac0b3b0c2ffe13f3dd0 SHA-256: b4b5ffac14bf570e55450662818cb560d18add36105158cc7693c08819906df9
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, impersonating Facebook to trick users into clicking a malicious link. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-daily-free-spin-app-game-hack, is associated with malicious redirector infrastructure and brand-impersonation credential phishing. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to deliver a malicious payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/coin-master-daily-free-spin-app-game-hack.
  • 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-daily-free-spin-app-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_off000034d0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34D0 24976 bytes
SHA-256: af7e2ea8875907cc2638b218e41e3e49c523a54fc8dbc92d88a5865bd89b7c2c
font_01_sfnt_off00006e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5D 18308 bytes
SHA-256: f9a3a46f76b0cae8a4d9bd0baf07f2a5aefd3f4554b846be65e0119e8f17791d

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