Malicious PDF — malware analysis report

Static analysis result for SHA-256 509ba67744e415cc…

MALICIOUS

PDF

39.6 KB Created: 2021-05-17 06:33:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e1a5315fd570cef2a70f4f3ca6828313 SHA-1: 8fdeb3f12c0fc6b94be0885360ac79de4902fb38 SHA-256: 509ba67744e415cc31c96e3e791d95acd7bf7244c82c53cb53a8ba094d23e465
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising a "Coin Master 2021 Free Spins Link Today" and "game hack". The heuristic firings indicate that these links are part of a redirection lure, designed to trick users into visiting potentially harmful websites. No scripts were extracted, but the presence of malicious redirectors suggests an attempt to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-2021-free-spins-link-today-game-hack In PDF document text
    • https://coinmasterspinandcoin.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000035ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35AE 24204 bytes
SHA-256: c514534f0806f29e3cce2dc1213b03fbba47d97607b60cffc2d3df0c5571878c
font_01_sfnt_off00006d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2E 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00007759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7759 18812 bytes
SHA-256: 1796d469d6688880968d5d589eff493e0f1aaa6a9dd62a8c2503fd741fb93e80

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