Malicious PDF — malware analysis report

Static analysis result for SHA-256 655319d25088b435…

MALICIOUS

PDF

51.3 KB Created: 2020-08-24 15:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4ad4cb0ebe652b26cb5b55fd8080d3fd SHA-1: c14cd53607a8a0db73373969c2bba5876152b129 SHA-256: 655319d25088b435847bcdc4fe83962275a45101394f5c1b5377e73c9e6445eb
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating an attempt to lead users to external content under the guise of a free resource. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm the presence of malicious redirector links and a link farm designed for SEO manipulation. The document body, though partially corrupted, contains text related to 'free labor calculations book' and the redirector URL, reinforcing the phishing lure.

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.com/pify?keyword=livro+calculos+trabalhistas++gratis In PDF document text
    • http://files.artbyamandahorn.com/uploads/1/3/1/0/131070539/rifipena-dirukizi-bajubabitadoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/91920185856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6870/0310/files/vezurazipune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/taxigazufoziduxuxurezep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8003/1137/files/general_characters_of_aves.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/wupudurutufegevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/1849/0780/files/pubusezepojegetozojepam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/75447655051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/31610686364.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/23519713627.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 4

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_off000074d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 4860 bytes
SHA-256: bf2aff6c4814a0ae08b1d548a9a2008f19b0f3a622f1e8df24f262983ebe77be
font_01_sfnt_off00008566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8566 14608 bytes
SHA-256: eead86dd1fce19fcedcdbd031ee1d9cba15d09fbe2e803d5967f510d60ad507a
font_02_sfnt_off0000b0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

Open this report in the interactive analyzer, or submit your own file for analysis.