Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2db1cfbbed9bd9…

MALICIOUS

PDF

83.9 KB Created: 2020-07-30 17:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0970de582a11d3d34731541f12976467 SHA-1: 73545ceba87773596c2b5a182f216d83e976fc38 SHA-256: 6c2db1cfbbed9bd96a232aac492632877fe4129d44b4096c2bc612f9d54b761a
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm used for SEO poisoning or to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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=bell+s+palsy+treatment+guidelines+pdf
    • http://files.southernaddictiondecor.com/uploads/1/3/1/0/131070161/683911c33.pdf
    • http://files.superiorclinics.com/uploads/1/3/0/7/130775027/732619.pdf
    • http://files.deitzlandsurveying.com/uploads/1/3/2/8/132814898/7987237.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6258/3711/files/kajubut.pdf
    • https://cdn.shopify.com/s/files/1/0439/6145/0654/files/goxebete.pdf
    • https://cdn.shopify.com/s/files/1/0429/9613/8137/files/22875177878.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/konirizutir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52209678420.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/fodiripi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1764/9819/files/nedosimorotididoro.pdf
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/4301207161.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/44141956622.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/bigafuwabibefefov.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3929/files/jigurokexilafonen.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/58116694107.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_off00010a5a.bin
3437f8561e13270323b60cab11c3225ffc4a40af542e50f6f49084e4509225a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5A 5284 bytes
font_01_sfnt_off00011c3f.bin
41d53fda16892ae14037010eeb9f7f77adbff9e4e678d3ef18b1fa50fee21a2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 11164 bytes