Malicious PDF — malware analysis report

Static analysis result for SHA-256 6031712962bb310e…

MALICIOUS

PDF

42.9 KB Created: 2020-07-31 18:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c0bbd3f0c630ee6a213266469cf2508 SHA-1: 40cdc371758b9794de77c718c872cd44f247b0fc SHA-256: 6031712962bb310e5da197c6aa0d9191dca234016fa09157f4a197cbeb0ad494
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final destination of the malicious content. The document also contains a large number of links to external PDFs, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to attract victims. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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/wb?keyword=metabolismo%20de%20lipidos%20pdf
    • http://files.firebirdnewzeal.org/uploads/1/3/1/8/131856105/9cfd0e2233.pdf
    • http://files.nascidesigns.com/uploads/1/3/2/7/132740871/2740282.pdf
    • http://files.quebecbandassociation.com/uploads/1/3/1/8/131871674/sufeko_didadokemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kawovuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/lixokidozefus.pdf
    • https://cdn.shopify.com/s/files/1/0440/5090/7286/files/29756799218.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/68998267663.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/fikigipofexaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/86943239026.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/dutobix.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/zikupabuvenawuvilowunazek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kebiwubinixakagaxirefu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2597/9813/files/satomu.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_off0000685c.bin
63dee2b4669d96c0585abadeaf1c9a9b4abe0301eb992b5eb966f729febbbb94
pdf-font-stream PDF embedded font (sfnt) at offset 0x685C 5236 bytes
font_01_sfnt_off00007a1d.bin
c532ee41cfdd9461911c2d287251945d9a8f4262a72c9a54fee0f8dffd8073ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1D 10836 bytes