Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d87692b3b1a5129…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 14:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b77605807bc55823428d7cb23359f5aa SHA-1: e8747ac661c522a98d693ec5a59afa57fd2391ef SHA-256: 5d87692b3b1a51298c027c1af609ba632dc208a09475f140a574d5c6fdb359f2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) that appears to be part of an SEO link farm. The primary lure is a link to a PDF titled 'Advantages and disadvantages of probability sampling pdf', which redirects through ttraff.ru. This suggests a phishing or scam attempt to drive traffic to malicious sites. No scripts were extracted, but the embedded links are the primary threat.

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=advantages+and+disadvantages+of+probability+sampling+pdf In PDF document text
    • http://files.theapowers.net/uploads/1/3/1/4/131408970/dixirukifudu.pdfIn PDF document text
    • http://files.pegsjewels.com/uploads/1/3/2/3/132303378/bigimed.pdfIn PDF document text
    • http://files.millrdcommunityspace.ca/uploads/1/3/0/7/130775402/jimig.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/1/0429/9623/6447/files/velugifogesuvefolipez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/titan_air_compressor_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8065/5775/files/95454349714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/94863263520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3106/8823/files/liduzajotilixoti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0635/2804/files/99218711346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6795/7660/files/characteristics_of_genetic_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/zikuninedoka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3105/0915/files/how_to_make_a_group_in_discord.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/kosoxa.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 6

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_off00006d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 5652 bytes
SHA-256: 8f46cb1c3152836bd8cfc38b45bf9ce011a2a83257ce98aaf51f5707742fa821
font_01_sfnt_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 10312 bytes
SHA-256: 338d6b3dc65e50d978987e6f84fb84d330c738b9981922703e5080903a093389

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