Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ac3411c1b9090c…

MALICIOUS

PDF

35.2 KB Created: 2020-09-06 20:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d663e86139636e1302a207a6f37d4801 SHA-1: f2656f3bbd5b77b68cc5992ea2c6a42bc5792756 SHA-256: 73ac3411c1b9090cffe9daaa3a8b6d7788ebd764c54e66a38bf4ff616355737b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.club/wix?keyword=acer+aspire+one+model+zg5+manual', is identified as a malicious redirector. This suggests a link farm or SEO poisoning tactic designed to direct users to malicious content. No scripts were extracted, but the presence of the malicious redirector and the link farm indicates a phishing or redirection attempt.

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.club/wix?keyword=acer+aspire+one+model+zg5+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/xafomadujigikijufov.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/belzebubs_blackened_call.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/2182651501.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/60184875630.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8816/files/wivum.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/dafarutotipekiwojugomasaf.pdf
    • https://static.usrfiles.com/ugd/48bf55_3c6d6fcacb164de3ad46ef13be2b22ff.pdf
    • https://static.usrfiles.com/ugd/221f3a_cdae4789a7894eb391b155cdc8f8be69.pdf
    • https://cdn.shopify.com/s/files/1/0441/1251/1128/files/mamevopepofulupedibexudel.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/all_quiet_on_the_western_front.pdf
    • https://cdn.shopify.com/s/files/1/0443/8884/3686/files/all_type_bearing_sizes_chart.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_off00004ad5.bin
50aee31cc7f8019edd71f7febce0dc8c47799fd0417477237e662a431a3347e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD5 5556 bytes
font_01_sfnt_off00005db3.bin
e7796c56a848934322a27ac7489579d108f7f48a0d1d87c5c13afc2e85f2a81b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB3 10464 bytes