Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ce870363f4ab49…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 18:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b78af6e55276fc5b6a712893e9f96fe SHA-1: 127fbe8c828483a6c17f22c31492a3ceaf3a9693 SHA-256: f2ce870363f4ab494c38372eba286158d7952b977051eb27cafdc5ad960a49b4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, and the document body text includes the same URL. This indicates the primary purpose is to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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/wix?keyword=9+piece+puzzle+template+pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/asme_b31._3_acceptance_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/html_css_template_for_personal_website.pdf
    • https://cdn.shopify.com/s/files/1/0434/0462/4021/files/27769145704.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/51957093534.pdf
    • https://cdn.shopify.com/s/files/1/0435/9749/6488/files/xanevejilarisuzujiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/bein_sports_2_australia_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/9346141843.pdf
    • https://static.usrfiles.com/ugd/f09a9d_959078dcc3624fe9aa4a46d285b43554.pdf
    • https://static.usrfiles.com/ugd/ca300b_e07f4b6a706540f3a27be34f6fe64950.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3b7ca92888249e296afda1197882672.pdf
    • https://static.usrfiles.com/ugd/0d9a50_6bc6dedf284b4ad593a6a3424c63f4bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_9777f37234af426b81211da50e060df8.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c4.bin
cf599c24058ca5ee1583d39faa38a4c8ff54462f2df15e1b40620a376c83a12f
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C4 5140 bytes
font_01_sfnt_off0000763c.bin
de34e65cc3365a58b82f7dca8bee1c666b4482eeda3ddea4ad6f753655c29643
pdf-font-stream PDF embedded font (sfnt) at offset 0x763C 9944 bytes