Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fe3f570d17c788…

MALICIOUS

PDF

35.9 KB Created: 2021-05-21 22:07:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d21632cbe3bb6d112de8961758a7ec6 SHA-1: 0c32974cbe9241708e4ca74e91d4c1a179de11f6 SHA-256: 83fe3f570d17c7882e59d9e7a9e08417ed142f0e205dde2ba0216e00c3eeb0c5
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure. The document body and embedded links promote a "free Robux generator" lure, which is a common tactic for distributing malware or conducting scams. The embedded URL is the primary indicator of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/431946152/free-robux-no-verification-no-survey-game-hack In PDF document text
    • https://collectrobuxIn 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_off00002b62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B62 27356 bytes
SHA-256: cdac84d89af0f439a8aa45ac5236329623dba7f01f782d70cbda2abcc32ccbfd
font_01_sfnt_off00006947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 18892 bytes
SHA-256: 71091a6cc5ee2467f7d55b23aad8276d14a961c51a29e0f15aa3bcc69cbd56da

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