Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5188d3970ce71f…

MALICIOUS

PDF

39.7 KB Created: 2020-08-12 22:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 11a58787868436612d3d9ec63079ad41 SHA-1: 48aa7761fd62746febd204521dac489f6d57daa9 SHA-256: da5188d3970ce71fce6280bb0ca4d58e8982865a1a356887698dd86ebe82171f
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting a deliberate attempt to lure users to malicious content. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

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=aashto+lrfd+bridge+design+specifications+7th+pdf In PDF document text
    • http://files.chinadynastybeamsville.com/uploads/1/3/1/0/131070846/sipigiro_xesejeso_nuvadopatuwazo_kolag.pdfIn PDF document text
    • http://files.heartsonghomestead.com/uploads/1/3/1/4/131453177/bafaxirige_xudipawofowo_kokibolo.pdfIn PDF document text
    • http://files.alliguem.com/uploads/1/3/0/9/130969059/mivifogogawolopeza.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/1/0430/7353/6149/files/sixuraketubasuxale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5168/7848/files/gojefetatopibetopitadavol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5840/5280/files/39504812648.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/92851887690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/lewuzixefina.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6968/4377/files/audit_number_tx_dl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/23859514030.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7745/1428/files/19038382300.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8852/7006/files/witcher_3_all_gwent_cards.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4180/0860/files/present_perfect_simple_already_yet_just_exercises.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAC 5628 bytes
SHA-256: 15eeef60cfabb2019d3414525d5d742be47b03cee3a9ef1ef4e06e72a42500ed
font_01_sfnt_off00006ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECB 10288 bytes
SHA-256: 2128a8ffa8b5f4db8b1cd9fa3558b50e0f40264068fa355c3c661ee5873353c4

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