Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e89eb7a0401f0…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 09:05:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6cfe8fee15cd51dfb71b8dbe8a207253 SHA-1: 8696b9a3e8a390b09042e3e4ec9bd0a817616bf5 SHA-256: bf3e89eb7a0401f06ee398a1e0d7ceb320848ccfe4acd6669fbcae3d6eeb420f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and other PDF files, masquerading as 'free generators' or 'game hacks'. The primary lure appears to be related to Robux for Roblox. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack designed to lead users to potentially malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/robux-generator-no-verification-2021-game-hack In PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-link-spin_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/robux-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-coins-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/worst-client_GM479516143.pdfIn PDF document text
    • http://rkh.go.th/ckfinder/userfiles/files/minecraft-114-4-download-free_GM479516143.pdfIn 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_004_off00004f73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F73 24392 bytes
SHA-256: cb8dab436378ae7908ec52528860fc0c5f06002743c92d3b5ee6dcd9dc741b2d
font_01_sfnt_off0000878a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x878A 18836 bytes
SHA-256: 70c9af4927528042a9e3503934bee4caa1d9283cda5f59bc037173645e872bda

Open this report in the interactive analyzer, or submit your own file for analysis.