Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c57bb98b5ec3511…

MALICIOUS

PDF

124.8 KB Created: 2020-08-11 04:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 72766f4a063ef0ee64e7eff48841d1d5 SHA-1: 9190b9e458527cfd150a0072f95cf11f8cd106a5 SHA-256: 2c57bb98b5ec3511e0fa025d3e12e4d924d825a3a8127f6cd41716a143a577f5
194 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the string 'English year 5 sjk textbook pdf', suggesting a lure. The presence of PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics indicates a campaign to distribute malicious content via link farms. No scripts were extracted from this sample.

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.ru/pify?keyword=english+year+5+sjk+textbook+pdf In PDF document text
    • http://files.goodbyehellocrafts.com/uploads/1/3/0/9/130969915/kaninis.pdfIn PDF document text
    • http://kadupeta.maquisprojects.com/uploads/1/3/1/4/131438216/5480054.pdfIn PDF document text
    • http://files.yoursosweetamericandi.co.uk/uploads/1/3/2/7/132712229/katanonisazese.pdfIn PDF document text
    • http://files.polarstaryouth.com/uploads/1/3/1/6/131636746/petepokomak.pdfIn PDF document text
    • http://files.jcct-tucson.org/uploads/1/3/2/6/132683137/3558101.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/1/0434/5724/9430/files/69188416831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3082/1529/files/vefeluwiluxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/68588178785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6346/6391/files/bulupudebomometilefejosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/16942128656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/tivuwalaroferadun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/food_cost_percentage_formula_excel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/77438713920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1880/3610/files/6908945559.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81274949660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6929/9098/files/kavefolowetedulekaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27392185694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/xesumadilefezigipe.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_off00019cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CBE 5832 bytes
SHA-256: f79d4c5d2b22f0949d0cfa3cd40387e745d268de6a97ed2099f884245576f9ba
font_01_sfnt_off0001b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B09D 16856 bytes
SHA-256: 8d8e0102b0b728256f2e764cb9f1035caf1791b8d911b0aaad8d4b0e02c5fae6

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