Malicious PDF — malware analysis report

Static analysis result for SHA-256 445085d1207920ac…

MALICIOUS

PDF

38.5 KB Created: 2020-09-10 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 023db9fbf8ea2bcc7183e26327e8bd2a SHA-1: 2c534092b2865429e2132af097f45b343e7e500f SHA-256: 445085d1207920acd5f1650700ff06cb8caa213919d8d896b3634f1aa6978cde
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for users seeking templates. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector suggests an attempt to lead users to a phishing or malware-hosting site.

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=professional+powerpoint+template+for+interview In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/noredekagowepitavubawuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7702/5446/files/88131597350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0301/9170/files/clearing_browsing_history_on_android_phone.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b49c6_3cc0d895986045e8ad22fee05385b4af.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a12125_493d62f85f18471ba1b7fcddd69ff979.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bb13a2_2e90be80e17140ba83193a8eacdbb8ee.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9421c8_fe23de8bda5a425c8c6147acf4dd05b3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/21e6f2_da2912ace3da4c249e450e0eaf020b83.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4cf28d_4aecb9baa300439898f2b04e9e8a744c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f3ecbe_34ff0dac97c146678ff6d05425970e7c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A25 5200 bytes
SHA-256: f39341502a439287735702fbe548f9e319090879f37402ffa945873d5582804f
font_01_sfnt_off00006bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD7 9796 bytes
SHA-256: d468c581d01c7fc281b9891e06b7f9f5b9a841fef2bf1b9330e0179067f2f175

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