Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8c4f0d8efb1a4f…

MALICIOUS

PDF

55.6 KB Created: 2020-08-05 02:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 9481ad5a442cc8a900e3a183e4a1a4e9 SHA-1: 548e8a8ed90d7cba2709e524234f1721fee825a8 SHA-256: 3b8c4f0d8efb1a4f2f5fbdbbb47a439b42bb7d081e4e7cbc27cc2f0f1be8bc88
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=boletin+informativo+ejemplo+pdf', reinforcing the redirection attempt. The presence of numerous Shopify links, while many are benign, suggests an attempt to blend malicious links with legitimate ones.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=boletin+informativo+ejemplo+pdf In PDF document text
    • http://files.tenderyearschildcarellc.com/uploads/1/3/0/9/130969932/5270271.pdfIn PDF document text
    • http://files.drmelissacordero.com/uploads/1/3/1/4/131408353/a63f5b145973c.pdfIn PDF document text
    • http://files.writinglifebarbaraoneil.com/uploads/1/3/1/1/131164488/nenefubiwurabuwawo.pdfIn PDF document text
    • http://files.hbbapa.org/uploads/1/3/1/4/131408169/4c4e53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8289/0912/files/battery_tender_plus_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/tefejofix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/13693740523.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/36914322469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/58993975199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/zebenimawopiwinewumon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9502/9915/files/73051150776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70745323757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/29389358048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2693/2124/files/52173689644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9417/2058/files/60816434022.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/47887698910.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/75835457979.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C57 4980 bytes
SHA-256: 16c246275541bcbcb553495bc4b78aae7444057a7b644da1088a8dc67bf361cd
font_01_sfnt_off00009d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2D 11164 bytes
SHA-256: 0df6e9828d99d91d049ad77c9b70de37cd71e9e9c3f3c408381d725c74b9a4f7
font_02_sfnt_off0000c163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333