Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc81db3653b75cee…

MALICIOUS

PDF

60.6 KB Created: 2020-09-02 04:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df226c0ef9fe11f649b7636db524efd2 SHA-1: 7151e01896180dbc92d2068017255c6543e617d9 SHA-256: bc81db3653b75cee722f06a4d9392a6657fac633404251e403577f9fc065a09f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=shared+calendar+outlook+app+android'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a link farm. The ML classifier strongly indicates maliciousness.

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=shared+calendar+outlook+app+android
    • https://cdn.shopify.com/s/files/1/0431/1246/4550/files/ac_dc_electrical_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0433/0189/6347/files/nafataxisikavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/vopevimixomidoze.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/wekizabelakogujisubazako.pdf
    • https://cdn.shopify.com/s/files/1/0449/2463/3243/files/t2_ankle_arthrodesis_nail.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/kanipej.pdf
    • https://cdn.shopify.com/s/files/1/0431/8881/3988/files/american_gods_neil_gaiman.pdf
    • https://cdn.shopify.com/s/files/1/0432/5110/5947/files/90793356038.pdf
    • https://cdn.shopify.com/s/files/1/0436/9701/2890/files/45720667203.pdf
    • https://static.usrfiles.com/ugd/68ec51_43c29cba9c1c4a24b153b4fc116fad8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fa446c470eb4569818538220fc8a54d.pdf
    • https://static.usrfiles.com/ugd/b9801a_cc245bffc8f248db83eae4230cafad2f.pdf
    • https://static.usrfiles.com/ugd/ab922d_95a191eda77446e0bd6dffaf0f7376b7.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/limude.pdf
    • https://cdn.shopify.com/s/files/1/0429/1254/6975/files/89419025645.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_off0000b014.bin
206a0ad93351bf3818e83475009469d6d9ec6d7038c4fc11f1cbbd9bc25117f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 5152 bytes
font_01_sfnt_off0000c196.bin
1629a589956c1ca97ce94ee5e609699590df17276cd262bf36f73efdd629da8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC196 10504 bytes