Malicious PDF — malware analysis report

Static analysis result for SHA-256 552d953edbfbf2b4…

MALICIOUS

PDF

41.8 KB Created: 2020-08-14 21:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 345be09e67cab334cc64cb724eb7b88b SHA-1: 5fcec9a2d30d41884e60e87f8e22dfebfc7c576e SHA-256: 552d953edbfbf2b47e41749cf32e7a30c7050f8755c1aa81cc15dc2cd564cc04
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is the primary attack vector. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation to lure victims. The ML classifier strongly supports the malicious nature of this PDF. The embedded URLs are used to redirect users to potentially harmful content.

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.cc/wb?keyword=hindu%20holy%20book%20ramayana%20in%20urdu%20pdf In PDF document text
    • http://files.berkshireheros.org/uploads/1/3/0/7/130775320/gujanulifuz.pdfIn PDF document text
    • http://files.mammologix.us/uploads/1/3/0/7/130775205/4868771.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/1/0433/5465/2822/files/espaa_en_africa_subsahariana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1656/8482/files/61310472537.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/0707/8564/files/9033044494.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/87677979560.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8000/6294/files/josijegipuminoxubevuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/fivefeberesiburugoveki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/85373864390.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/ximunevepujikupeko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/lowegagevapuwojek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/fixinosev.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 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_off00005b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5B 5368 bytes
SHA-256: 0250cf1140017444b38b1d0c9df5f31b4b22131e349acee8689e24e029f87f86
font_01_sfnt_off00006d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6B 1936 bytes
SHA-256: 73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
font_02_sfnt_off000076ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76AE 10396 bytes
SHA-256: 2ae260a30cc88fb3c99111aec8e1e1b930a8b0c9e554ff388d6e88f437246a7e

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