Malicious PDF — malware analysis report

Static analysis result for SHA-256 de532c23af3fe640…

MALICIOUS

PDF

45.4 KB Created: 2021-05-17 01:43:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0c7e5c6f66d87e7e06e5fb27dc57fd79 SHA-1: 42d619d2ac70786220e669e061bc00185ff630ca SHA-256: de532c23af3fe6401947bd8834ad9653eb2e3c2678c8ead96ad65c3161cb6c6e
142 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external PDF files, many of which appear to be part of a link farm designed to lure users to malicious content. The document body itself suggests a lure for "Minecraft Windows 10 Hacks", and the presence of a "Clipboard command execution lure" heuristic indicates the document may instruct users to copy and paste content into a shell, likely to execute a malicious payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-windows-10-hacks-game-hack PDF link annotation
    • http://warehousewestllc.com/images/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://warehousewestllc.com/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/free-vip-roblox_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://warehousewestllc.com/images/coin-master-daily-gifts_GM406889139.pdfIn PDF document text
    • http://warehousewestllc.com/images/is-minecraft-free-on-computer_GM479516143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004914.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4914 25632 bytes
SHA-256: 42676a702e893d033ef5c3588d8d4d6f9ec4da060864c4185dec045a632f2e3a
font_01_sfnt_off0000838c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x838C 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9C 18696 bytes
SHA-256: 14f86b407040f424958936cb2b2b49b26067a8980bd50a77917f0563cc1bff87

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