Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb01bf93cdf45bc…

MALICIOUS

PDF

48.9 KB Created: 2020-07-30 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7d3f1df5f7fd247f231b4edea837d042 SHA-1: bf90043840ef234e6a6486e954d905decad079e6 SHA-256: efb01bf93cdf45bc70b37846fb2d495be951493cf8251ab221c26aafc3ebe1a5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. It also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDFs, including one hosted on Shopify. The document body, though heavily obfuscated, contains the text 'Gramatica de uso pdf vk', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL.

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=gramatica%20de%20uso%20pdf%20vk In PDF document text
    • http://files.carlystong.com/uploads/1/3/1/3/131379971/xotimulewabi.pdfIn PDF document text
    • http://files.5dmarketingandconsulting.com/uploads/1/3/0/9/130969986/58a76e30b7366.pdfIn PDF document text
    • http://files.katjasymons.com/uploads/1/3/2/7/132740260/3758946.pdfIn PDF document text
    • http://files.genehamiltonartist.com/uploads/1/3/1/4/131437457/togirowida.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/1/0433/3332/0872/files/pabij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2816/0413/files/petetizujekowelenatig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/batavogezobimuvamutijiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0266/5892/files/mubamapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/jujezidir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/luxekuvoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/tesujidak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/64738494980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1628/1512/files/30337149947.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/fusaxusuraguvadosigezom.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_off00007343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7343 5200 bytes
SHA-256: 33b4a7aa6ca9cf1b936954e67e137281c959c905d6aabd48048ac6ff35e9d439
font_01_sfnt_off00008503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8503 15492 bytes
SHA-256: d2280f268b23a17ed2b397bc08abbb98992cc0ec451d46b8afaa9106d99e624e

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