Malicious PDF — malware analysis report

Static analysis result for SHA-256 79643350a0dd0efe…

MALICIOUS

PDF

40.7 KB Created: 2020-08-18 23:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304b6c9855151a7787d46b1313a3df4a SHA-1: cfd8827b1ea5dbfb5c8af826797fef41688ca632 SHA-256: 79643350a0dd0efec36242ea67b9c23d39047818eb55e94e9a0e980757b2783d
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL and text related to an 'exit interview template', suggesting a social engineering lure. The presence of numerous other PDF links, many pointing to Shopify domains, indicates a link farm or SEO manipulation tactic to obscure the malicious redirector.

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/pify?keyword=exit+interview+template+word
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.sharadslunchbox.com/uploads/1/3/1/3/131397973/tigib.pdf
    • http://files.iriselainecottagebnb.com/uploads/1/3/1/3/131398279/lasev_fevajama_fitebaf.pdf
    • http://fivujifud.janajedermann.com/uploads/1/3/0/8/130814328/a5be696243f94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/critical_role_campaign_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4965/files/46270040948.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/16533947412.pdf
    • https://cdn.shopify.com/s/files/1/0435/9867/6131/files/neoliberalismo_y_educacion_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8262/files/60369557908.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/comparative_and_superlative_adjectives_and_adverbs.pdf
    • https://cdn.shopify.com/s/files/1/0428/6221/5324/files/mikiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/6439/1845/files/zudumesefilup.pdf
    • https://cdn.shopify.com/s/files/1/0431/1639/6697/files/css_child_selector.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/6th_grade_math_practice_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/2002_toyota_tacoma_repair_manual.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_off000062f4.bin
2416ee15c9982a91bb4356fea6989daa8387ead85bd6e8150f43dd53ae06b2a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 5104 bytes
font_01_sfnt_off00007441.bin
1dceca920562af95e455a2de399aae110319f03e52f3b6b33aafdefc642fe5f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7441 9828 bytes

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