Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa58ca13c11829a7…

MALICIOUS

PDF

42.1 KB Created: 2020-08-09 01:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3aa66ab37b2bd2ab5421c8ca5c4ce3c9 SHA-1: 45d1238e3940ce4999268d9b85977f50ae74d702 SHA-256: aa58ca13c11829a744dfd1713d12148c6f99c97482783b99866d5dc1d125bdd8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Staphylococcus haemolyticus tratamiento pdf' and mentions 'wkhtmltopdf', suggesting a lure document. The presence of multiple links to external PDFs, many hosted on Shopify, indicates a link farm strategy to distribute malicious 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.ru/pify?keyword=staphylococcus+haemolyticus+tratamiento+pdf In PDF document text
    • http://solaj.metricarms.com/uploads/1/3/0/8/130874254/8967798.pdfIn PDF document text
    • http://files.the-authorscorner.net/uploads/1/3/1/0/131070912/bonuripofi.pdfIn PDF document text
    • http://files.trimstechnology.com/uploads/1/3/1/3/131384025/zewiwetu.pdfIn PDF document text
    • http://files.myfinalsnotes.com/uploads/1/3/2/6/132681694/4ae1db9553585f.pdfIn PDF document text
    • http://files.brandgenius.com/uploads/1/3/1/3/131383764/wobarone_fegufujilibu_dowemuvun.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/1/0431/6063/3504/files/14006576184.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/xobojeginavirajorotun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/5403/3054/files/anomalia_de_ebstein_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3337/0522/files/food_allergen_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/kuwawukafikezigifupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/bowiripuwurava.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/40687977783.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/zifig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/antihistaminicos_de_ultima_generacion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3003/6123/files/actinomycetes_thesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/94491176032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6995/5486/files/29926616895.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 7

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_off0000642c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642C 5600 bytes
SHA-256: d1cd83c82ee52b310297c339f389f3b2b88e1b43fc89b64e63986cfd7e414175
font_01_sfnt_off00007712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 10076 bytes
SHA-256: a456db393885d1c790733b20ea40abc83b1c6455419ed854732b7b3ba28a6dbe

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