Malicious PDF — malware analysis report

Static analysis result for SHA-256 6793eefb83aa8b10…

MALICIOUS

PDF

55.3 KB Created: 2020-10-01 04:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 34c364aae2f21ae316602350d5667cb2 SHA-1: f7bde729df0ca72824b09546715745ca09b7c632 SHA-256: 6793eefb83aa8b106e00592d3c7240535e18cd067aae9209453c92c1247aa6d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics as a known malicious redirector. This suggests a phishing or redirection campaign aimed at driving traffic to potentially harmful content.

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://gettraff.ru/strik?keyword=angielski+w+t%25C5%2582umaczeniach+gramatyka+5+pdf+chomikuj In PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/94788595176.pdfIn PDF document text
    • https://site-1039721.mozfiles.com/files/1039721/xewuduxavopatozixokek.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/3527849318.pdfIn PDF document text
    • http://files.queeniespetservices.com.au/uploads/1/3/0/8/130874400/dikiwipuvovedo.pdfIn PDF document text
    • http://sowoz.grahamstead.com/uploads/1/3/0/7/130740522/665bfe3e.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/59159554065.pdfIn PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/77314325738.pdfIn 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/1/0437/7716/3426/files/60013998445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8048/2967/files/14436001516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5628/3296/files/lokivewudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/dinghy_tow_vehicle_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3698/9850/files/zodiac_weapon_guide_reddit.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_off0000901e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901E 6124 bytes
SHA-256: e3e2a48709308b0a9e020122d22a586b1a686debc2c42f7f0080f70e5c5b4614
font_01_sfnt_off0000a508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA508 13200 bytes
SHA-256: a79ff92bd4e95342709133605fd02b91f6ae738ff50c228a86df3e8a1c74d087

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