Malicious PDF — malware analysis report

Static analysis result for SHA-256 13523afe79b942e4…

MALICIOUS

PDF

40.8 KB Created: 2020-08-23 11:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b68d7f251d0e7a0733fb40ea5f6ccfaf SHA-1: cdff70d1f9d665a91a7392483ee7cca649ef8b19 SHA-256: 13523afe79b942e49161397494d66f1cc00ecbcaa197369ee57260e8f8048ec7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, masquerading as a grammar cheat sheet, that redirect to malicious infrastructure. The primary redirector URL is https://ttraff.cc/pify?keyword=basic+english+grammar+rules+cheat+sheet. This indicates a phishing or scam attempt designed to lead users to harmful 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/pify?keyword=basic+english+grammar+rules+cheat+sheet In PDF document text
    • http://vuruji.briansweetdesign.com/uploads/1/3/0/7/130775169/wudilisiper.pdfIn PDF document text
    • http://files.wickedsweetrentals.com/uploads/1/3/1/4/131483214/gifojasapexor_melam_rilome.pdfIn PDF document text
    • http://files.libertyshelties.com/uploads/1/3/2/8/132816202/58eefa.pdfIn PDF document text
    • http://files.mayusaeki.com/uploads/1/3/0/8/130873880/a31fee30b.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/1/0432/5670/9288/files/18979724164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1240/7967/files/68175064052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/9701/7768/files/professional_baking_6th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1243/7662/files/bagri_market_fire_accident_report_writing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/98774508290.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/35093221919.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/terraform_aws_iam_policy_document_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4299/5367/files/kurenaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/budget_sheet_printable.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 5264 bytes
SHA-256: 60eeedea50b9ecfabd69dcec6fc77cfcd6d9f6fa5cb3cbdcc440c030dd729798
font_01_sfnt_off000073c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C2 10072 bytes
SHA-256: bac64e67c326375732c31a68a89dbbd579a8f952871ad897073747e89847fc09