Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd5e8a6a3736333…

MALICIOUS

PDF

42.8 KB Created: 2020-09-06 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84f58c8c81c55ce366d5cc0ef7a8bec7 SHA-1: 2388fd432d78911368d3fd2adbeddd8a55383d63 SHA-256: 6fd5e8a6a3736333672412b92eabc1b47495047666c02d39d1b188f51b3b0819
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that leads to a URL associated with known malicious infrastructure. The document body, though heavily obfuscated, contains text that appears to be a form title and also includes the malicious URL, suggesting a lure to trick users into clicking it. The presence of numerous benign-looking PDF links in the document is likely an attempt to blend in with legitimate content or to obscure the malicious link.

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.club/wix?keyword=form+6b+affidavit+of+service+2016
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/4517/5971/files/kexujunip.pdf
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/rig_veda_samhita_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0447/0842/9977/files/spelling_test_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0432/1230/8637/files/difference_between_active_directory_and_domain_controller.pdf
    • https://cdn.shopify.com/s/files/1/0432/1853/4557/files/eldar_codex_7th_edition.pdf
    • https://static.usrfiles.com/ugd/eed56f_8a1cee2988c24aea925e3f1d20ade8a2.pdf
    • https://static.usrfiles.com/ugd/65b209_f4767389cfbc436892515915ee377c0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e38f667fcf874eafb195180f138fee3d.pdf
    • https://static.usrfiles.com/ugd/37428b_743e6ba744f447cbbb7cff8ad4edadae.pdf
    • https://static.usrfiles.com/ugd/fb5067_3dfe819675ef48c9b9986f6cd29e19d5.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/husqvarna_automower_105_manuale_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/0371/5489/files/employee_incident_report_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/55616351694.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/guxereputa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8820/7255/files/butchery_business_plan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cb1.bin
e9c901dab016126b76fa06479be14b97a3b8647b73045f96ecaebb4b1d089403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB1 5452 bytes
font_01_sfnt_off00006f45.bin
4fb892e5a052639d0b9721c2e328f90dc5af48079e110a5d74eee61922dde17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F45 9708 bytes
font_02_sfnt_off00009074.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9074 4324 bytes

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