Malicious PDF — malware analysis report

Static analysis result for SHA-256 8261598b01d0cd4e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-20 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e1d93730cb5614705252594cc64abac5 SHA-1: 8cbfc0c1367204be85e7ca9b0082c7dfa23ce833 SHA-256: 8261598b01d0cd4e85fc7ca8b74c619f268e35b4ac7afce9c96354eeb1c96c7a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous 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 and embedded links suggest a lure to download further content, potentially leading to malware or phishing. The presence of multiple Shopify links, while some are benign, is part of a pattern to disguise the malicious redirector.

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=new+testament+bible+tagalog+version+free In PDF document text
    • http://files.indonesianorphanages.org/uploads/1/3/0/7/130739239/jugik.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/1/0431/8907/6117/files/55038133008.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/4828/4839/files/mathematics_definitions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/38300361765.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9946/4611/files/genemujetexezazofo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1500/1496/files/ladixedoxekevo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7225/7181/files/93945858909.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54171278856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4008/0021/files/mamovulozixaliwugibifid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6019/8557/files/92927889364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/android_radio_developer_options_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3154/3463/files/95016898127.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 1

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_off00005d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D64 5348 bytes
SHA-256: fefdc53bf875044b1e883d0d96c4c438a9a103f1eb6baf7ab8f853434ce1ab6c
font_01_sfnt_off00006f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9E 11444 bytes
SHA-256: bad4f3d1aed4640433260465f757704458226a05f6b92564c3a6fc9e38934414

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