Malicious PDF — malware analysis report

Static analysis result for SHA-256 793e535d6b49921d…

MALICIOUS

PDF

40.7 KB Created: 2020-08-13 05:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 984fc4bd5ca6dfc064ab77f88f191dcc SHA-1: ecd9d83c4ca6408c0243798eaff47d5f5619ef9c SHA-256: 793e535d6b49921d5803e778f8e9816a918698879aa65e239d54fa32260a8da4
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 text related to 'Thirty years war book pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to download content. The presence of many Shopify links, some confirmed benign and others unknown, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/wb?keyword=thirty%20years%20war%20book%20pdf
    • http://files.nowmetoo.com/uploads/1/3/1/4/131437535/kudakupira_vagoju_teromawoloj_naxesed.pdf
    • http://files.theactivelifecoach.org/uploads/1/3/2/7/132712129/liwejogifulufuz-dilekosezokexu-xujaje.pdf
    • http://files.endhomelessnessla.org/uploads/1/3/0/7/130775823/5760073.pdf
    • http://fenabipe.verisoftgroup.com/uploads/1/3/1/3/131380042/6504097.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/install_genesis_kodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/8454161499.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/best_self_diary.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5404/files/97623733021.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/rashidun_caliphate.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/fuvewezilabomewive.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/lazunixelokudapirapapat.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/191850010.pdf
    • https://cdn.shopify.com/s/files/1/0431/1924/7514/files/54895172414.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_off000061b2.bin
e8cef7acbe22d27d4be25ab16a1f9c85f463ad8f9f8848ff712301278aed5afb
pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 5444 bytes
font_01_sfnt_off0000743b.bin
b6b518b30620702bdac88c5f75cadb1b60438c8d26a3eceb069b3b9070305373
pdf-font-stream PDF embedded font (sfnt) at offset 0x743B 9960 bytes