Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1791e238bba87c…

MALICIOUS

PDF

45.5 KB Created: 2020-08-16 00:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 1aa2edce837f5f504e7d1b6dbdb1711f SHA-1: b5fe5c51364ad8d2bfc295666134391c4a4946d5 SHA-256: 4c1791e238bba87c70f72182fd9a9c7521c2e7e24a6bbbccdf2868259e7eb93e
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The presence of numerous links, many hosted on Shopify, suggests an attempt to obscure the final destination or to leverage legitimate platforms for hosting malicious content. The primary malicious URL is https://ttraff.cc/wb?keyword=bts%20mikrokosmos%20piano%20pdf, which is likely used to redirect users to a phishing or malware distribution site.

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=bts%20mikrokosmos%20piano%20pdf In PDF document text
    • http://zodifir.toledofire2.com/uploads/1/3/1/0/131070767/fabaw.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/1/0432/1984/5278/files/alchemist_book_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8124/4577/files/buzorizupasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8297/3345/files/fractals_gw2_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/rezojufibixona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6030/5825/files/44013142109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9020/6115/files/7759068346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/26346860943.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0439/files/the_asch_effect_a_child_of_its_time.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/costing_methods_and_techniques.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/nakibesoxagudiluf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 3

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAE 3468 bytes
SHA-256: cb7131a4bae600447b8987c4f47dcd391b8e9755d035fa1e2e6f04080127010a
font_01_sfnt_off00005726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5726 5268 bytes
SHA-256: ddcb271183edd40d205d6a1ef54e02aeba2ed5a8ba24eecb6a59814b0ec7af75
font_02_sfnt_off000068f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68F6 13452 bytes
SHA-256: c201c517647dae86cc93664d4ea36d1b513d28d3bdd05691674b95c36cb59bea
font_03_sfnt_off00009441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9441 16080 bytes
SHA-256: 705cd36d9c2227ee052114be9604a9bf84eb8c2476a52f9da8c5a7759dbb33cb

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