Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e02b361a22bef…

MALICIOUS

PDF

42.3 KB Created: 2020-08-02 18:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7d4649f61fc7f08511e3e9205cc833 SHA-1: 1a70c40a6fff31ab6430bf2c1f4a17af5fd0b534 SHA-256: 5a4e02b361a22bef02252c0ec6a56c03d32e3bfc8d9bfe757cc75d102862dfaf
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1203 Exploitation for Client Execution

The PDF contains a lure related to uninstalling software, instructing the user to copy/paste commands into a shell. This, combined with the embedded malicious redirector URL, suggests an attempt to trick the user into executing commands that would download and run a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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.cc/pify?keyword=uninstall+tomcat+7+ubuntu
    • http://files.serv4all.org/uploads/1/3/1/3/131383342/0a27d02e.pdf
    • http://files.sb-defense-lawyer.com/uploads/1/3/0/8/130874431/9ef1d2bf17b.pdf
    • http://files.signsbylynn.com/uploads/1/3/1/4/131483317/kolib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/31958226543.pdf
    • https://cdn.shopify.com/s/files/1/0429/2247/5687/files/fojunekafijutur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/67351804986.pdf
    • https://cdn.shopify.com/s/files/1/0440/5529/8213/files/mafowade.pdf
    • https://cdn.shopify.com/s/files/1/0439/7678/6078/files/47957178393.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/73427851675.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/tevosisof.pdf
    • https://cdn.shopify.com/s/files/1/0434/0881/8333/files/redoganobitene.pdf
    • https://cdn.shopify.com/s/files/1/0428/3485/4051/files/pivobor.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/safinuwibipajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/30068827772.pdf
    • https://cdn.shopify.com/s/files/1/0447/8962/9085/files/pocket_tanks_deluxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/28515206837.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/babuwezifobaritixugakow.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006816.bin
01f2516435b978d9d3653fbd2233b8e75cf6862855a31bec5589596f110cc2aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6816 5060 bytes
font_01_sfnt_off00007946.bin
9e2dec7aefd6d7425b167a3f423fdcc999493af6432b233d6ec604f97c1d433a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7946 10216 bytes

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