Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7d0046edd5d151…

MALICIOUS

PDF

113.5 KB Created: 2020-08-03 09:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc11aefe4b65af195bd9cae7f1c11609 SHA-1: 279408fe3dabe73dfaf916d0920fe065602eaf5c SHA-256: 6b7d0046edd5d15124106b9c3abf4aadaef40467e21d6c38ac1fc734d88933f2
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains a mass external link farm, with one URL pointing to known malicious redirector infrastructure. It also includes lures for installing browser extensions and executing commands via the clipboard, indicating a social engineering attack. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.com/pify?keyword=r%252F+piracy+megathread
    • http://files.nowlunenburgcounty.com/uploads/1/3/0/7/130775284/286957.pdf
    • http://files.communityconnectionsaz.org/uploads/1/3/2/6/132683181/6f2fdfffdeecc3.pdf
    • http://files.timsfantasytips.com/uploads/1/3/1/4/131437295/fubaluwomu.pdf
    • http://files.fantaminals.com/uploads/1/3/0/9/130969385/mekufogudozujupov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2180/1371/files/fl_studio_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/1888/7073/files/basubimusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/0892/4568/files/32107619032.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6074/files/kuxokogi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/67276319121.pdf
    • https://cdn.shopify.com/s/files/1/0432/9907/8299/files/52298776878.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/67524944131.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/39185829289.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/46129928095.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/vuzukalixuvivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8104/files/79539918706.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017435.bin
cda8c15e371ecf4addadcdb193e58fed86a7641d0abfcc88bf7bc8703f76cf87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17435 5424 bytes
font_01_sfnt_off00018685.bin
1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18685 1964 bytes
font_02_sfnt_off00018fdf.bin
7972fcb2b896467ab696d11f61872bc1b45a1b6d4d9a6bb429a3f8ae0921a6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FDF 11972 bytes

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