Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac1a24336f65e4a…

MALICIOUS

PDF

45.2 KB Created: 2020-08-13 07:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 37e3730e55104ccbf6e9f5bc765bf836 SHA-1: de172111f9ed33e7aa8dc29acb672cc0151777d2 SHA-256: bac1a24336f65e4a79517f5d3b8e73ad14b3c0d6e6e610bec0e87765c3e9e0ff
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/wb?keyword=sistema%20inmune%20celular%20y%20humoral%20pdf, which is likely intended to trick the user into clicking through to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the 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.cc/wb?keyword=sistema%20inmune%20celular%20y%20humoral%20pdf In PDF document text
    • http://nojaga.nhddenver.org/uploads/1/3/1/3/131383314/fusuduwinusowan.pdfIn PDF document text
    • http://fenaguta.michaelspauley.com/uploads/1/3/1/8/131856584/dakaja_lodoseginepate_jimedezedupegi.pdfIn PDF document text
    • http://files.foresideandalusianstud.com/uploads/1/3/0/8/130813764/muwif.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/1/0429/1877/2903/files/galininiwedomosili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/data_abstraction_and_problem_solving_with_c_solution_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1502/0448/files/48887540728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53262414385.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/the_language_of_desire_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fusuzirosaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/saxon_math_1st_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0668/8412/files/the_young_like_it_hot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/1648876971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3415/4907/files/16355947898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9979/8166/files/73527484828.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9812/9059/files/jidinivijego.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 5

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_off000069b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69B2 5600 bytes
SHA-256: 4911335a93ec702944c59ed0058aef2bb56198ae283bafd6f79887dac9f7436a
font_01_sfnt_off00007c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8A 13888 bytes
SHA-256: e793dcfc6529eee9814924b607fcfbb1006b76bd646a1a7801a70c10e6edc7c9

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