Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf96cc410bbff10…

MALICIOUS

PDF

43.6 KB Created: 2020-09-16 15:40:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02887895ce14bf80f9a083be28e54497 SHA-1: 9d5170b554f91ba2e53b68512a9ae27e8ae6cfa8 SHA-256: 5bf96cc410bbff103ec7fefc5f5aa15daf31b19a88e2ffc8e137b08463c18f2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, https://ttraff.me/wix?keyword=atv+channel+guide, suggesting the document is designed to funnel users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=atv+channel+guide
    • http://files.nicolefranz.com/uploads/1/3/1/6/131607269/7880543.pdf
    • http://files.mrdoghk.com/uploads/1/3/1/3/131379312/5779344.pdf
    • http://files.melissaleighgibson.com/uploads/1/3/0/9/130969633/bovilap_vuzufuw.pdf
    • http://xifubu.operationsavekc.org/uploads/1/3/0/7/130739850/9785532.pdf
    • http://files.artandhonor.com/uploads/1/3/0/7/130738622/disipojobop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7368/1061/files/quran_reading_and_writing_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/1048/0537/files/godoritatupinudididaten.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/22068755685.pdf
    • https://cdn.shopify.com/s/files/1/0434/7094/6456/files/64351687575.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/45664229728.pdf
    • https://cdn.shopify.com/s/files/1/0431/9540/0356/files/jodad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1757/6354/files/biology_answer_key_2019_kcet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2836/4968/files/15337777650.pdf
    • https://cdn.shopify.com/s/files/1/0466/7709/8661/files/john_paton_davies.pdf
    • https://cdn.shopify.com/s/files/1/0435/6725/1617/files/gatesixitulunowurixi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4021/1097/files/sebifenifopafazenopigez.pdf
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/fuentes_moviles_de_contaminacion_del_aire.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d43.bin
b38339586a8ef009739000bb15e0406703f1bf55dd8753600867cd12195c0f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D43 4976 bytes
font_01_sfnt_off00007e35.bin
1d33748e18133a757787e52f1747f66284a73e53f9c17d7e016468de65f63f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E35 10364 bytes

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