Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51da44a055c3a28…

MALICIOUS

PDF

45.9 KB Created: 2020-08-08 03:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 42c63943de24d1b66c7bd49e66b700b0 SHA-1: 4573d227e7792d3acca0002bc74def6fb03a57b4 SHA-256: f51da44a055c3a28a20ba5a61bb7aacebe6978b877a46134881024e65eb71da9
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that these links lead to known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though partially corrupted, contains the same URL, suggesting an attempt to trick users into visiting malicious sites. No scripts were extracted from this sample.

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=concrete+admixtures+handbook+ramachandran+pdf In PDF document text
    • http://mopiluta.designbyalyssamarie.ca/uploads/1/3/1/6/131606027/letexix.pdfIn PDF document text
    • http://wepugaf.texastyp.org/uploads/1/3/1/4/131410007/jezawaboguguf-kamiwefab-xuwadu.pdfIn PDF document text
    • http://files.beaulandis.com/uploads/1/3/0/8/130874524/1328628.pdfIn PDF document text
    • http://vitawe.watercolorcreativitylessons.com/uploads/1/3/1/3/131380213/xigidadetunibixas.pdfIn PDF document text
    • http://files.abnist.com/uploads/1/3/1/8/131856545/jujawereb.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/1/0434/4122/5880/files/76444992375.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/kenexoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8697/1033/files/basic_principles_of_internal_auditing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/59835890153.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/land_purchase_agreement_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/21782512178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0200/2595/files/99_names_of_allah_poster.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8993/5003/files/lerurilopeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/nimet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2844/6358/files/riwix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7576/3353/files/fimisume.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/pebolibotaxazure.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_off00005d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D55 5540 bytes
SHA-256: 03a63a8989480840add35511abf2d71181bc3694a2fc76f013f3d3aca7ab2921
font_01_sfnt_off00006ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF8 2116 bytes
SHA-256: 89454d8ece1be00d2333aac76955f46ed17c4d141322e635bf27f42efb43e54e
font_02_sfnt_off000079c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79C4 14992 bytes
SHA-256: 554cc245e440f89cbc4d18644b8496dad1e04911f44b2cfb14232041f70f5353