Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f173cf1b546d0c2…

MALICIOUS

PDF

34.7 KB Created: 2021-05-20 16:43:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 037f18cbc4753e13eed5be6f1595fd90 SHA-1: 1e43fb64cf2262e5e48e131e2a0e7463b2565cb9 SHA-256: 4f173cf1b546d0c26793c250b44657f0362af20cc830b5f6a9a089ae82b68e7f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a website offering 'free Robux' and 'game hacks', a common lure for malicious sites. The heuristic firings confirm the presence of a malicious redirector link and a lure for a game hack generator. While no scripts were explicitly extracted, the PDF structure and embedded content suggest an attempt to drive users to a potentially harmful external resource.

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-sites-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002dc3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DC3 24268 bytes
SHA-256: 252f2e565889b23209f69e09e2431e5fae3ef7139d3729626f153f74c0787e8e
font_01_sfnt_off00006529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6529 18640 bytes
SHA-256: b8260c20a5a482fa631977c1895ef4fabb59c0a91f65cf95745fb521070d0a95

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