Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4d93bdcd851a4a…

MALICIOUS

PDF

44.9 KB Created: 2020-08-29 03:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc8c510363df7b3006ced8c2d8d5903 SHA-1: eb04ba88928e96ceab6d90e127307dfee1b90822 SHA-256: 9e4d93bdcd851a4a577b0b3f5389aa83ed28fbb9acbfadccbe3e79e04c2d803c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a known malicious redirector. The document body contains garbled text but includes the URL 'https://ttraff.ru/wix?keyword=final+burn+alpha+rom+list', which is identified as a malicious redirector. Additionally, the PDF contains a large link farm pointing to various PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious verdict.

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=final+burn+alpha+rom+list
    • https://static.usrfiles.com/ugd/b8c837_e87892ca4c7e4248a1aceebb1b1a3e4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2547b1021bf48eeb844fbaefa0c135d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e5da1b3069347dd8e0e2853f2914e38.pdf
    • https://static.usrfiles.com/ugd/b8c837_77cb21cf24514371b15494b830b71abf.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f5df364077b4c2c9bb7c1e71aeafdba.pdf
    • https://cdn.shopify.com/s/files/1/0432/8361/1801/files/78990177099.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/police_nsw_report_lost_property.pdf
    • https://cdn.shopify.com/s/files/1/0440/2148/1622/files/24518416515.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/tamadovoduvazawuravul.pdf
    • https://cdn.shopify.com/s/files/1/0430/7373/2768/files/xopujosuwumaxirowakab.pdf
    • https://cdn.shopify.com/s/files/1/0438/2795/3824/files/visiting_card_mockup_psd_file_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/apc_full_form_in_hotel.pdf
    • https://cdn.shopify.com/s/files/1/0433/8099/8298/files/mivos.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbc3e5146f5d47b9bd1c8682daaed1fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_876449ef327f4cc7a744b2149235bcaa.pdf
    • https://static.usrfiles.com/ugd/b8c837_935a8343ec544018a841e5ed105e3f9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4a1e0df20a64ef7af329f888e2a8ee7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6955e9d84cd848d2a21972a51ac05b6a.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/
    • https://static.usrfiles.com/ugd/b

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fed.bin
779188757f0df12b9014396f706c24ac51aaa673d18b85dab288b2b832b485c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FED 5156 bytes
font_01_sfnt_off0000813e.bin
0265c2749f07e82d8f378d0c64541de2e5136142af45fd8c209325a1e5143588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x813E 11184 bytes

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