Malicious PDF — malware analysis report

Static analysis result for SHA-256 86caf5b7c70a648d…

MALICIOUS

PDF

37.4 KB Created: 2020-08-29 23:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f4f03a88e374a46af3177476f86e5bc SHA-1: 519383677dd7b0ce74533eccb57183f9edb73604 SHA-256: 86caf5b7c70a648d2d8376886280aa6ce374932a011f567bf486c6d229cb0245
162 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, a common tactic for SEO link farms and potentially malicious redirection. One prominent link, 'https://ttraff.ru/wix?keyword=principles+of+fraud+examination+well', is flagged as a malicious redirector. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking the malicious link. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wix?keyword=principles+of+fraud+examination+well
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2286/6842/files/website_accessibility_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/limulagodefeditigov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/figesagemuxil.pdf
    • https://cdn.shopify.com/s/files/1/0460/0905/7441/files/15211743497.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8002/files/14638981791.pdf
    • https://cdn.shopify.com/s/files/1/0463/5443/2161/files/86161626340.pdf
    • https://static.usrfiles.com/ugd/b8c837_a973b37b504147cd9253f887e3dad7d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_75af4c98b558483ab5b7d42cc283ab75.pdf
    • https://static.usrfiles.com/ugd/83e24f_2268dbdf864144be9432c95bc1fc1255.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8842bec2de24456a8403725306eee8f.pdf
    • https://static.usrfiles.com/ugd/5b5da7_f961e58f03c940af9bd2d62b939407a3.pdf
    • https://static.usrfiles.com/ugd/217d68_c7827684fb164d6194754c29669b62c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ee1c28aca8949a5a4f2c35802287cec.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_off00005457.bin
61ea7cb50a8326ac105b25f4bc8418e644e2887f64fe043772c316287a513b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5457 5460 bytes
font_01_sfnt_off000066dd.bin
f96ff9ce661c844ce715f4ec67fef51bda1c84f9ca3898f61ede26af51fd30a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DD 10016 bytes

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