Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77721aebcd58d82…

MALICIOUS

PDF

42.0 KB Created: 2020-08-12 19:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b9bede2969be8d413f40fd1009477eb6 SHA-1: ec1d513e08ad0ddff01287ef65f0cb85aaf37bfb SHA-256: a77721aebcd58d8286738df7756c21cf7b85953dfd93b32ebe1e87f44962c771
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a 'computer basics worksheet'. This link, `https://ttraff.com/wb?keyword=computer%20basics%20worksheet%20section%2010`, is designed to lead users to malicious infrastructure. The document also contains a large number of embedded links, many pointing to `cdn.shopify.com`, which is indicative of a link farm used for SEO poisoning or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious.

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=computer%20basics%20worksheet%20section%2010 In PDF document text
    • http://kokikona.wilesbolt.com/uploads/1/3/1/4/131454012/430860.pdfIn PDF document text
    • http://files.chandascreations.com/uploads/1/3/1/4/131452878/mabiwan.pdfIn PDF document text
    • http://files.lash-lab.com/uploads/1/3/0/9/130969984/dozobefokevo.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/1/0428/3976/9254/files/construction_submittal_form_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8226/1415/files/vajavameba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4398/6330/files/ruvipevemupufi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/9476975315.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/nibeguzonuwawosogivivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/what_happens_at_an_engagement_party.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6232/4376/files/gentle_chair_yoga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/30454047675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8576/6564/files/jefoguvowogop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6789/0069/files/grade_10_english_fal_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/paxotaxazojulilinitulo.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 3

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_off0000650b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650B 5536 bytes
SHA-256: b020643481ae2f4865c0e0f8d498a6f9da14819868fd023fa5f06bb815fd92bf
font_01_sfnt_off000077c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C8 10380 bytes
SHA-256: 14866c904f64c40d53720214fc06dfede148f6d2fe2cc3cf893349dbf21192f1

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