Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c4fb5fcf62ebd4…

MALICIOUS

PDF

36.2 KB Created: 2021-05-21 20:41:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ed7902d3c1f4ad08bb0ecfaa7e2d79e1 SHA-1: b72c4298f05723d3dcd27d56e30254a840efd9d9 SHA-256: f5c4fb5fcf62ebd46235d217945ee087d6857221401ab6fb5bc1fafdc391cd60
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with the promise of free game currency. The document body and heuristics indicate a clear intent to redirect the user to external sites, likely for further exploitation or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/can-you-get-robux-for-free-game-hack In PDF document text
    • https://cluster-consulting.com/images/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-games-with-free-boombox_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/robux-free-robux_GM431946152.pdfIn 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_off0000333b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x333B 24796 bytes
SHA-256: 29dc59df0d8ce3089697ce054cfc036a93773a1ab007ff834c37d65bf68cabe5
font_01_sfnt_off00006b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 18508 bytes
SHA-256: c061b59ab901ec7c7e5d17bc5fec7ace191fd36e08e64edc0ca642be8bf86a0e

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