Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42b9759b42dd744…

MALICIOUS

PDF

41.5 KB Created: 2020-08-24 03:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5630835a00e4fbf67b2b52663460fd4f SHA-1: 3dcc7eff4f1110ed27345b21810e2b73a42effa9 SHA-256: a42b9759b42dd74494a9e23f24588437a743b4657632c4d8ac71fcec46a66252
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the text 'Audit report writing format' and the malicious URL, suggesting a lure to trick the user into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external PDF links, likely for SEO manipulation or to obscure the malicious redirector. 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.cc/pify?keyword=audit+report+writing+format In PDF document text
    • http://files.thurlingguitars.com/uploads/1/3/0/8/130874063/3514529.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/1/0440/2115/3957/files/4831897939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/410_shotguns_prices.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/31448505602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/94881569297.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/38030367601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/risebamasakagefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2440/7961/files/31318256034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3422/9398/files/63652370221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/87816641704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6041/0006/files/64869816954.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8172/8151/files/78717997330.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 4

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_off0000646f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x646F 5232 bytes
SHA-256: 813da2b92701fca9aa7f142d2c00f49ddbac7005c2207c359e8968d0a1cd53b4
font_01_sfnt_off00007639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7639 10248 bytes
SHA-256: 88d2114d87b0e90902eafbe3ef5ab18e3490fc4fb4ebcbe737acd2fd66d7ffb0

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