Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d32b49fcb5ebb…

MALICIOUS

PDF

49.1 KB Created: 2020-08-21 14:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5b1a77097b6eaf892ca16de1652a4e17 SHA-1: 339a7ffd6dc34cfbbd3b8170c915dfd27f2a7686 SHA-256: 635d32b49fcb5ebb3476d48adce5c8a7d9bb5d36030a73a7922ac7b399dd39af
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. This suggests the PDF is designed to trick users into visiting a malicious site, likely for phishing or malware distribution.

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=does+barium+chloride+form+a+precipitate In PDF document text
    • http://files.trinitylutheranchurch.com/uploads/1/3/1/3/131379830/rulixovuxekape.pdfIn PDF document text
    • http://files.artfix.info/uploads/1/3/1/8/131871621/fudaga.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/1/0462/1444/7257/files/28211492357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7784/2584/files/81483031039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/39229700506.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/psicologia_definicion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/80446605436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/international_business_strategy_management_and_the_new_realities_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34515707504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/masije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/henry_ford_assembly_line_worksheet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E18 6492 bytes
SHA-256: b9c1bd2281f23f09d905494077011cda678d8ff8a20e62f41a46584ce81a564d
font_01_sfnt_off00007e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4D 5532 bytes
SHA-256: 6f9e866de8891bd86ef5c1ce0d5de998fc7adae8073ef7426aa4452dc2bb525b
font_02_sfnt_off000090f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F6 10976 bytes
SHA-256: 5fdb02e17231f0985252de57d72bb3eab7b449343aea83a6ae870642652f2bd1

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