Malicious PDF — malware analysis report

Static analysis result for SHA-256 267e328fb0766e98…

MALICIOUS

PDF

47.1 KB Created: 2021-05-14 16:38:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3218018b57d1fb60f2cfeae1cbc8def6 SHA-1: 353cce360f77956825472707004dbac0c9d4c1a7 SHA-256: 267e328fb0766e9829b8c81dd51793e7a0b3f75a5658acdb475c95d66bbf4bed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The document body and embedded URLs suggest a phishing attempt to trick users into visiting these sites, likely to download further malware or engage in credential harvesting. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/how-to-get-free-robux-without-email-game-hack In PDF document text
    • http://kupidrbpz.hr/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/free-minecraft-skins-girl_GM479516143.pdfIn PDF document text
    • http://kupidrbpz.hr/images/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/coin-master-free-coins-and-spins-group_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://kupidrbpz.hr/images/earnrobux_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://kupidrbpz.hr/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://kupidrbpz.hr/images/how-to-get-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bcb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BCB 26700 bytes
SHA-256: 83d991d7f6a88b669e6e7e1eac1efc29414bb91ab943559d3283191eeb2b9b85
font_01_sfnt_off0000880d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880D 3084 bytes
SHA-256: 4889dc98a6bfd3c9244583f92387be58625a91e7a969778ad35ada89b27ed636
font_02_sfnt_off000092b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B3 19328 bytes
SHA-256: 2bb545c14ce80967bc964a539ce1fba7d75b9199f0e299556cda79647f99e488

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