Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d376b321e7b6dcf…

MALICIOUS

PDF

34.0 KB Created: 2020-08-15 12:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7b3fe92f1219e0751209ab719898410c SHA-1: 63977f2a9da9e3106c61aa42e6f51393a94ed330 SHA-256: 4d376b321e7b6dcf1a4e37458ce8f5dbfeb052f4a3eefe002dc5af3371d068ff
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, a technique often used to create SEO link farms. One of these links, `https://ttraff.com/wb?keyword=grammar%20practice%20for%20intermediate%20students%20with%20key%20pdf`, points to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous shopify.com links, while benign themselves, are likely used to mask the malicious intent by appearing as legitimate content hosting.

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/wb?keyword=grammar%20practice%20for%20intermediate%20students%20with%20key%20pdf In PDF document text
    • http://files.amandaaiken.com/uploads/1/3/1/3/131380045/2214164.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/1/0435/8130/9085/files/poultry_production_in_the_tropics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1292/2264/files/karowavotawibuzemazuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/zafejexive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/59753790324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/kali_linux_tutorial_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5662/5829/files/alankar_class_9_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/zakanivexoxeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3350/0565/files/17359895841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3417/1813/files/bronchial_asthma_in_child.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 2

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_off0000471b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x471B 5652 bytes
SHA-256: 0cc154550637aa8ee65d9b9618deacb0c57469ba87e8a6571106e69ace6d7166
font_01_sfnt_off00005a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3D 9688 bytes
SHA-256: d523990b4df67d7480a095d76ac1938effb5b31d5bbab9a6cf1b5a951f3ffd79

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