Malicious PDF — malware analysis report

Static analysis result for SHA-256 04aa61cb805cf966…

MALICIOUS

PDF

40.4 KB Created: 2020-08-05 04:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b6f71e6d57483273bc1874eba2c409f3 SHA-1: 4f9e4e922b728a3f3e6c3cdf4070321e85275aa3 SHA-256: 04aa61cb805cf9669c06dec17c2e53f4147b2f5aaacd7dc7872a8c2faddb0855
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to a redirector service (ttraff.com) disguised with keywords like "computational complexity pdf". The heuristic firings indicate this is a malicious redirector and part of a link farm, suggesting the primary goal is to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=computational+complexity+pdf In PDF document text
    • http://files.bucketsforjesus.org/uploads/1/3/1/4/131414516/rujuraneno.pdfIn PDF document text
    • http://files.runforreece.com/uploads/1/3/1/6/131637570/3332663.pdfIn PDF document text
    • http://files.siochantafarm.com/uploads/1/3/1/3/131383934/1566323.pdfIn PDF document text
    • http://files.teachablemoments-ok.com/uploads/1/3/1/4/131454316/3a04b6ee.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/1/0437/4809/8209/files/the_myst_reader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/9695068876.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9291/7924/files/lonob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/79728199133.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7591/0294/files/53113061561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/25678516957.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/31403164532.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8835/4207/files/kunuvut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/30950117611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/astm_a370_18.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bebupikisanomagidilu.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 6

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_off000060df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 5104 bytes
SHA-256: 7bb9e551f3e48262a1f3b7fa12cedfda83a1d16e29223e64b40c22243ba629c6
font_01_sfnt_off0000723b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723B 10280 bytes
SHA-256: 02538636fcf141e02d897cf281b7f1d11f2e54013bb62adae32099fb17b439d2

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