Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f98e5077e418f…

MALICIOUS

PDF

62.9 KB Created: 2020-08-31 05:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ff2e59d9d804a18922da8d3f5263ef SHA-1: c9b354cd3ac5f95561a5c845f09ed6ce33fc096c SHA-256: 6b6f98e5077e418fa272fc0d6a026016e701855843302f419aa46e58b881d18a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. This suggests the document is part of a link farm or phishing campaign designed to direct users to harmful websites. The ML classifier also strongly indicated maliciousness.

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.ru/wix?keyword=dyndolod+could+not+open+registry+key
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_71ee7a45dfad423e9b5932f2d52fef28.pdf
    • https://static.usrfiles.com/ugd/b6edda_dcea279a4d764902bb2e5acb7f36214f.pdf
    • https://static.usrfiles.com/ugd/5b9a87_3eb13e97d3f5435a8b7778fcdccfff64.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e3b4622226e425fbc95cc7d4cf7127b.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc25a47a265146d5aba92136afab4e3e.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/gudumaxokusulosur.pdf
    • https://cdn.shopify.com/s/files/1/0460/0781/2257/files/d_b_financial_risk_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5054/8899/files/fire_magazine_file_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0459/7314/3719/files/rivovekedej.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/67372082840.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/wekemulisa.pdf
    • https://cdn.shopify.com/s/files/1/0440/3855/3765/files/76612872407.pdf
    • https://cdn.shopify.com/s/files/1/0437/2063/8632/files/espn_fantasy_football_rankings_cheat_sheet_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1235/files/xalimarawajovutatudur.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2310/files/84155034184.pdf
    • https://cdn.shopify.com/s/files/1/0464/6846/4790/files/qu_msculo_est_utilizado_para_intr.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0807/files/37457445510.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_off0000b6cd.bin
03494f8959c370d4767bfc3f8777aa9c25b278924ce3e34adc64dce0666dd55e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CD 5196 bytes
font_01_sfnt_off0000c897.bin
683b10ff0af4e320170254d62e96313b4458f5a88019af00d31a2b2aa44b22b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC897 11000 bytes

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