Malicious PDF — malware analysis report

Static analysis result for SHA-256 85acda9166c32c7e…

MALICIOUS

PDF

41.5 KB Created: 2020-08-03 04:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2b8448cac1adbe86b9daf70133685020 SHA-1: a1e386e056437011f019b16c98ad1972404ed8ed SHA-256: 85acda9166c32c7e0e10072b02fa83ac29bd58c33a757c9e0fe53e8316a0c9f8
202 Risk Score

Malware Insights

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

The PDF contains a link farm of 16 external PDF files, with the primary link pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the redirector URL, suggesting an attempt to disguise the malicious destination. The presence of multiple embedded URLs and the 'SEO link farm' heuristic indicate a campaign to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=dd-+214+blanket In PDF document text
    • http://files.kangarooislandvet.com/uploads/1/3/0/8/130814466/5375044.pdfIn PDF document text
    • http://files.castirongrilllubbock.com/uploads/1/3/0/9/130969717/47b9553b00f1.pdfIn PDF document text
    • http://gizowomuj.turtlebee.co.uk/uploads/1/3/0/9/130969426/98b28.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/1/0436/1607/5939/files/kofexanebalinakunisam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/appositive_phrase_examples.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/27951180121.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6342/7751/files/wiradakepugerixoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68513135127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8721/7311/files/6971102082.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/morifutav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2424/5155/files/gimob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7488/6563/files/seruvepizowib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/kosefanojogop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3832/4374/files/17291186679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/bonakafiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3789/2509/files/71746291282.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 6

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_off00006320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6320 5052 bytes
SHA-256: 6db1a98d98aed0c6b0cf5b054d9f4429a3acf50693985ff5ad6b9bb7e9f810fe
font_01_sfnt_off00007476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7476 10944 bytes
SHA-256: ae77928dae79344f42ad5be570f8743329a1dffaf53acd38be5e52be36a7c945

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