Malicious PDF — malware analysis report

Static analysis result for SHA-256 37eab0cbe81149f6…

MALICIOUS

PDF

44.1 KB Created: 2021-05-15 08:13:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a57878177af85870d68078cb99973491 SHA-1: 75b39bb0cb22ac1460200d359c892df744ca5407 SHA-256: 37eab0cbe81149f603fdb6afd002dc12d51ad063fb4e7d2a930a603bd9f43d9e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are structured as a link farm for SEO-optimized PDF lures related to game hacks and cheats. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious workflow designed to trick users into downloading further content. The presence of a visual download button lure reinforces this deceptive intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/gamesoffice.net-hack-coin-master-game-hack In PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/optifine-pe_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://uas.com.my/uploaded_files/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.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_003_off00004bff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFF 29692 bytes
SHA-256: 772a0ffbe8115a62abbc016882531fdfc5ac879705a1959f7935651201dcd9d0
font_01_sfnt_off00008ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 18044 bytes
SHA-256: 29769621f517b9af2b6051fd62e22acd3f15304c2918e063dab3d8ffe0b29dd9

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