Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c6cf7022eb9875…

MALICIOUS

PDF

41.6 KB Created: 2020-09-09 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 181731e9fbeef1cc166004a87414d212 SHA-1: 227399dc7a81494f0a1232539170b294e6481f0d SHA-256: 71c6cf7022eb98751ab3c6b2d63ff04038291583975c51d8a611caef4af24959
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary lure appears to be a 'Spanish placement test study guide', directing users to a redirector URL. The ML classifier also strongly flagged this PDF as malicious, supporting the conclusion that it is designed for phishing or malware distribution.

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.link/wix?keyword=spanish+placement+test+study+guide+utep In PDF document text
    • http://files.banksminiaturehorsefarm.com/uploads/1/3/0/7/130775396/wiwaxade.pdfIn PDF document text
    • http://rotelama.riittakuisma.com/uploads/1/3/1/3/131398362/8024229.pdfIn PDF document text
    • http://files.leaderboxessentials.com/uploads/1/3/0/7/130775172/1436979.pdfIn PDF document text
    • http://files.lourie.co/uploads/1/3/0/7/130776490/2e1fa2b22520a.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/1/0431/6538/4861/files/morphs_and_allomorphs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/81148721305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/30708276971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/87189415552.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/xoroto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/badozudumibefegotuvopojus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/raxolodizipapovif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/dugawagesawafawosugolurow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/florida_boating_course_exam_answers.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 5

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_off00006326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 5596 bytes
SHA-256: 61a91af3aa4730185388946f0a0f9c0f5923d8014a8482db7fd6bbf1165b35a9
font_01_sfnt_off00007614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7614 10400 bytes
SHA-256: bc2f27c9298a91c64f6f491ffd7047a7e93a60573f857d66b40f2ea96cbc807d

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