Malicious PDF — malware analysis report

Static analysis result for SHA-256 c166838dffbb4f53…

MALICIOUS

PDF

43.9 KB Created: 2020-07-29 06:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c3a0534dee31a0304e6a1601d23a5ea4 SHA-1: 44b1777233832a4a42d00e2a87f6b8d7200b0ec7 SHA-256: c166838dffbb4f53b5eab060caf61f55db371816fd63d1e3c3e34e97741bc413
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to malicious infrastructure via these links.

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=challenger+school+uniform+store+san+jose In PDF document text
    • http://files.basicambition.com/uploads/1/3/0/7/130739308/tuvubok.pdfIn PDF document text
    • http://files.arlenegersonphd.com/uploads/1/3/1/0/131070171/zasamuw_fefegipela_rikimixo.pdfIn PDF document text
    • http://files.teachingcolumbus.org/uploads/1/3/0/7/130738566/623e05e369.pdfIn PDF document text
    • http://files.longcrendonfilmclub.com/uploads/1/3/2/7/132740905/zizeninuminezi.pdfIn PDF document text
    • http://files.achievemediation.com/uploads/1/3/1/4/131438459/4166d.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/1/0433/0687/7080/files/949986333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/fososigewawuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/midalibiket.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/zojagelopikaxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/18681508694.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/gixeletupegomolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2439/7989/files/5904978971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5041/7827/files/gideripeloduze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/17863383719.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/32296312365.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/kuzeredabiretokutoki.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 8

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_off00006f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 5276 bytes
SHA-256: 691f83bf920c4a2d3501105816a0d9892f7d6fb9a5e7ac9fdcd4e178b5dbacbd
font_01_sfnt_off000080fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80FB 9796 bytes
SHA-256: 32ad9144899863304bb51d37c6f1936a0458c675af3d1e41c2725897cd37e6ad

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