Malicious PDF — malware analysis report

Static analysis result for SHA-256 9838e5473f0da60b…

MALICIOUS

PDF

42.5 KB Created: 2020-09-12 06:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2e6ea386d62b48deac03b2e29b816069 SHA-1: c9ff56f544f081c4b4dca4546d694b705df112ca SHA-256: 9838e5473f0da60b50045b890d5a95e341ae5a9fd7b2ff5156f0d150fd1fcdc8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be the same as the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to drive traffic to potentially malicious sites.

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.me/pify?keyword=sample+case+study+paper+in+apa+format In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/0bcf16_ecf89b40f83447c2bf6a9ccac6ef0b49.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c722c2_9840fe59ab0d4c1bb1d8c60b93a40451.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/34ec99_1e8e7a4210814d03b82b0941ef669c4f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e6e573_2d57ebe6673946a094188c1b18a5624f.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/da_638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7770/4607/files/registration_form_in_bootstrap_template_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7738/6918/files/valores_biometria_hematica_en_nios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2730/7416/files/i_can_t_hear_anyone_on_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/radimudowafazirudup.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/738632_ea0ec2e7db654dc19110870a64b1e1b5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/18122d_765726177f47479e861136aa6a1b0dcf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/685707_cb53398e6cf0478aaf63d23ca677bf3e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f55bec_909cf0f9eadb439e8d3939c53c0a775c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/39d081_207a342c77354ba380f89813176d6fce.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2941/7112/files/bleacher_report_nba_player_rankings_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/79105814155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8059/6121/files/kusavubeme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/76375677411.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_off00006843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6843 5508 bytes
SHA-256: 307ca407af018f407a8ec3155eb134f3d5860efd7c47876ccba0d4563e9cd258
font_01_sfnt_off00007aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEA 9940 bytes
SHA-256: 8366f4217ee55d7fa3c415c65a53f4d393a686ae6bbdd126e63e09f231eb7e0b

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