Malicious PDF — malware analysis report

Static analysis result for SHA-256 725112e5abf9ec8f…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 11:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89fcb61a0223153d63d74da8574f3c3a SHA-1: 534b156c85c84ca4f72448440b509f25348be45f SHA-256: 725112e5abf9ec8f064dff097934e27e2e15eabf6801628562a94454b4e309be
154 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially corrupted, includes a URL that appears to be a lure for downloading software. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to obscure the malicious destination or engage in link farming. 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.com/wix?keyword=virtual+audio+cable+full
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b910ae_5f7cf9a79bc34cdba51f2141db48937a.pdf
    • https://static.usrfiles.com/ugd/7f929b_7ddb968e9c8647e4bb1859719cd31110.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0b666fe00649d2ad93306a2b54fbd8.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/wevok.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/hardened_spring_wow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/basant_maheshwari_thoughtful_investor.pdf
    • https://cdn.shopify.com/s/files/1/0433/8896/0933/files/98342757436.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/68812428534.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/calendar_templates_2019_indesign.pdf
    • https://static.usrfiles.com/ugd/a107db_f7f617e98219412688b41cbe93c3cb65.pdf
    • https://static.usrfiles.com/ugd/b8c837_1df06a60e2a0448bb8c8dd8cb523d366.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005954.bin
7422ede8f8dbf920cb9be3b00e8f35bff9ea509497962d4a47a1b079aaf5606d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5954 4716 bytes
font_01_sfnt_off0000695f.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695F 1800 bytes
font_02_sfnt_off000071ed.bin
aed8fc36c557868eeec7b95d601772dc253d654f161a907f6c85037a8bae5e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 10120 bytes
font_03_sfnt_off0000948f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x948F 4324 bytes

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