Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9a7cdda672afac…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 05:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c4d0cafb10a52fd624e359887bfd2f1 SHA-1: bd0013da077560065daf9d23b18ef09bfffb4489 SHA-256: 5d9a7cdda672afac92682c040ac376b161d5dcde9ae093c04857483510a1095e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The presence of a large number of links, many pointing to Shopify, suggests an attempt to obscure the malicious destination or to appear as a legitimate link farm.

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/pify?keyword=chemistry+crossword+puzzle+answer+key
    • http://pefanow.dogswhojog.com/uploads/1/3/2/7/132712207/106085.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/epistaxis_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3356/files/curry_blake_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/mupemat.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/1._8_interpreting_graphs_of_functions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9167/9648/files/unity_reload_scene.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/95882029285.pdf
    • https://cdn.shopify.com/s/files/1/0437/7129/7943/files/dagadazadefisumi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/75653682116.pdf
    • https://cdn.shopify.com/s/files/1/0439/3032/1051/files/best_genetics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/kuwilokejuxekesobinudimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0650/8701/files/autodesk_2013_64_bit.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_off000061f5.bin
0dc4c9f735925a72ae3a80a4f7b3a8700e76c52cf02ba18b372d3efb0f41d4eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x61F5 5528 bytes
font_01_sfnt_off000074b4.bin
6253d3ffbae37d1a50b3478f874ff9b210c5c26b8874356db2fb2c43a4de2efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B4 10316 bytes