Malicious PDF — malware analysis report

Static analysis result for SHA-256 771da7456bd3a5ca…

MALICIOUS

PDF

34.6 KB Created: 2020-08-05 10:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4d5a2e3fdfff539e3ab403c2c67c6740 SHA-1: 525456a877158b9d59a10b99d7fbcb67e486e259 SHA-256: 771da7456bd3a5cab40afbbe373176f0370bd17762d8c7929c649860a769dada
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service, suggesting a link farm or phishing attempt disguised as a free download. The ML classifier strongly indicated maliciousness. The embedded links likely lead to further malicious content or spam, aligning with a spearphishing attachment tactic.

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.com/pify?keyword=acupressure+points+download+pdf In PDF document text
    • http://files.teacheronclimatestrike.com/uploads/1/3/0/7/130775361/vupebagoxesuzon-vibimilatuli-zonadisuzebili-refuvobijapuda.pdfIn PDF document text
    • http://files.hhinthegarden.org/uploads/1/3/0/7/130776131/1872416.pdfIn PDF document text
    • http://files.abigaildennistonphotography.com/uploads/1/3/1/3/131379689/dugonelozel.pdfIn PDF document text
    • http://files.hsisign.com/uploads/1/3/1/4/131406835/888488.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/1/0432/3213/3278/files/30042516428.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/xezaworegexitomoxesoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8111/2483/files/49833045434.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/28441388901.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/19321440854.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/sodes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/82973104521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/87507682658.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0089/7440/files/75998644237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2962/6013/files/xufafuzevejofuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/debut_video_capture_torrent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/vosopi.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_off00004b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3C 5228 bytes
SHA-256: 39a7fc50107df27f5bdcf8804daca2288c5b343d3bb11e7178917c9485db3883
font_01_sfnt_off00005d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D29 9504 bytes
SHA-256: bf5223c718eb5bcb39feddf69db55312920be347aa7620852be0193ab69e153b

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