Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f9f41427a34d1f…

MALICIOUS

PDF

40.9 KB Created: 2020-08-08 21:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7b64f38f5bba84b534f86f22e266d59 SHA-1: b4ef1221b4ea660c5d8412ed4831fe045eb4f3a8 SHA-256: e1f9f41427a34d1f2caa938adc8b9009a43918b900da9c13ee92fd6dd4881fa7
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, appears to contain the text 'Dodgeball rules pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to malicious infrastructure.

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.ru/wb?keyword=dodgeball%20rules%20pdf
    • http://files.jimlake.com/uploads/1/3/1/4/131437222/917701.pdf
    • http://files.moogallery.com/uploads/1/3/1/4/131437603/4945593.pdf
    • http://files.trfmontpelier.com/uploads/1/3/1/3/131398134/buxuparetifuron_niguje_botulagodoro.pdf
    • http://files.fredericksburgpresbyterian.org/uploads/1/3/1/4/131437956/7e2318416863.pdf
    • http://files.bluecruiseturkeytours.com/uploads/1/3/2/6/132695492/8497865.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/xapola.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/97245807331.pdf
    • https://cdn.shopify.com/s/files/1/0432/7482/9987/files/nuwixibalufomujazut.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/tonageloduralixef.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6593/files/sokobugepukikaludavulezev.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2334/files/zupifob.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/lavamujala.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/binary_tree_class_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/8554/5124/files/titatijijobatami.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15843942414.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/74688867163.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_off00006194.bin
8ab157a3340c54af1ce922dd241fbb8e3e31b7769c399ef35bbaa44243051154
pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 5348 bytes
font_01_sfnt_off000073cc.bin
800b1ad45c0058f7753804f87d8fcd212609dd003da7077ffb33de0d5be622eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x73CC 10336 bytes