Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d24563a81ce04c…

MALICIOUS

PDF

37.8 KB Created: 2020-08-25 13:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 19f31a0eeeba9c43b57f9e45e9b50c8a SHA-1: 2574ffb4b29b46ce150fe4c3f0cba0c8f9a32e05 SHA-256: 81d24563a81ce04c099a7c2a1e313b13da703090a2cd73c58b99685352061e9c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm designed to attract search engine traffic. A critical heuristic identified a link to a known malicious redirector, `https://ttraff.cc/pify?keyword=avatar+a+lenda+de+korra++mp4`, which is likely used to funnel victims to malicious content. The ML classifier also strongly indicated maliciousness.

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=avatar+a+lenda+de+korra++mp4 In PDF document text
    • http://fawivizuf.sdadata.org/uploads/1/3/2/6/132682347/mavebexinised.pdfIn PDF document text
    • http://fiposaw.atouchofclasshairsalon.ca/uploads/1/3/1/3/131379992/3281e04ac.pdfIn PDF document text
    • http://files.transformation4you.com/uploads/1/3/1/1/131163832/ea35f916f2c12.pdfIn PDF document text
    • http://files.attheranch.org/uploads/1/3/2/7/132740277/vufikevedin-dirulamopafixoj.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/1/0438/2123/6384/files/wadalefoxilovekudumatu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/limexonuxin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/rupor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/henri_bergson_laughter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4546/9858/files/boy_scout_cooking_merit_badge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5102/3510/files/75036093205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/pubod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3899/7665/files/72960496427.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/skyrim_filled_grand_soul_gem_id.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3550/9415/files/wupunuxujibofa.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 8

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_off00005543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5543 5128 bytes
SHA-256: f1b393078158bd6b44c9894b9f8381237a84103f3e9d9a15672cc9b93bd70d4c
font_01_sfnt_off000066ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 10532 bytes
SHA-256: 4fb702a7f06d9a6facc2d60539b10fe5cc8952ca9e551e44be2ac49fa69620ba

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