Malicious PDF — malware analysis report

Static analysis result for SHA-256 c991359d52e8fb09…

MALICIOUS

PDF

40.8 KB Created: 2020-08-11 10:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 48d55238ea2192dc4b23d318f20884c4 SHA-1: 3451d084bae341cebea9d67176a3f88449ebbefe SHA-256: c991359d52e8fb098c951ec16c7d1d03a07dc3847ae38956e13a37c3ebad56c6
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. One of the embedded URLs, 'https://ttraff.cc/wb?keyword=instrumentation%20definition%20pdf', is flagged as a known malicious redirector. The PDF structure and the presence of many external links suggest an attempt to lure users to external, potentially malicious, content.

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=instrumentation%20definition%20pdf In PDF document text
    • http://nelip.joshdipaolo.com/uploads/1/3/1/8/131857054/1f510b4057b1f9.pdfIn PDF document text
    • http://files.classroomcrosswordpuzzles.com/uploads/1/3/1/4/131437074/duzenuguputagefavi.pdfIn PDF document text
    • http://files.lizlaneriwellness.com/uploads/1/3/1/0/131070161/9269471.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/1/0433/1739/5611/files/matogarirekojekuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/fotenetudizub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/fiwegedofuramozur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/0013/8661/files/cambridge_placement_test_with_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/59951226545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/12746543515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2282/6142/files/97304141269.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/xusebibivelezanur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/36232609335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1478/1088/files/barriers_of_communication_in_workplace.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3023/9637/files/15530838137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/minnesota_vikings_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/maliralaziwum.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
🗂 Part of campaign: jacquelineschiffer.com 4 samples

Related samples 1

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_off000060f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 5092 bytes
SHA-256: 0d1f7c2881b5320f764b481affd473c3f8022b37e432711f4f11692b5e73a93f
font_01_sfnt_off00007223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7223 10764 bytes
SHA-256: 7c00cc8f0ada8923b9f15ee42c5bcaa57e81574a78aababaf7efd5020369faeb

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