Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a21923dcd61b72…

MALICIOUS

PDF

39.1 KB Created: 2020-08-15 01:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d339fb90db7b71f8e71895879e9fbcc7 SHA-1: 6f6fde6b1ea7a1eabdf4cc47a3be38cbfd97c2eb SHA-256: a8a21923dcd61b72c5b879d3f6d30a564f0650db950ac72ea4455ba778b45208
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a redirector link to 'https://ttraff.cc/wb?keyword=scaling%20questions%20pdf'. Another critical heuristic identified a PDF link farm, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the suspicious URL, reinforcing the redirection attempt.

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/wb?keyword=scaling%20questions%20pdf In PDF document text
    • http://files.meadowsparkapts.com/uploads/1/3/1/6/131606140/01f99e.pdfIn PDF document text
    • http://tixusimug.az-tennisacademy.com/uploads/1/3/1/3/131379992/relelakinovivina.pdfIn PDF document text
    • http://files.advancedanaerobics.com/uploads/1/3/0/9/130969555/davam.pdfIn PDF document text
    • http://files.hairbyshej.com/uploads/1/3/1/4/131437085/5895284.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/1/0431/7567/4012/files/58005653866.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3516/4835/files/glee_loser_like_me.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/41169985325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/bd139_16_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/numimerupazetonabik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8705/3475/files/37739952632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/5026/6787/files/borrelia_spp.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/4070/7484/files/96610105537.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_off00005a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A10 5456 bytes
SHA-256: 1eeeaec44672e1594af31f61551f9f561c09cb7d55827ce70126b3f07e490a3f
font_01_sfnt_off00006ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA2 10240 bytes
SHA-256: 2b773b23bef4258226e4899d97a0cbb66643ec31264bcbfe7c2636078fb7ea2f

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