Malicious PDF — malware analysis report

Static analysis result for SHA-256 424786f623c8f663…

MALICIOUS

PDF

37.5 KB Created: 2021-05-16 09:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 166f6b2eb06107a7d395018e8fb217cd SHA-1: 12b1d35fecadeef09f4a600fc8c26a637dff6194 SHA-256: 424786f623c8f66389adc2dd8bb2e421c032df98f11713dcc0132bbf70bf3e09
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as a lure for a 'free generator / game hack'. The document body and metadata also contain references to this lure. The embedded URLs and heuristic firings strongly indicate a phishing or scam attempt designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0313

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/479516143/minecraft-nintendo-switch-digital-code-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_003_off00003636.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3636 25492 bytes
SHA-256: b86ba4c2cdbc5ce87bcde84f75a0eb38d6d5e86f0f18c828c281b6cc695c1387
font_01_sfnt_off00007021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7021 18744 bytes
SHA-256: 39428c206c609bf194df99e48b3a05aaca79100e1a0a860ab3e065a57b3738de

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