Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9caeea3d526bb1…

MALICIOUS

PDF

135.1 KB Created: 2020-08-16 23:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4ea3ffceb411c67fbd8913d4cb38a9db SHA-1: 5e634eab6072a07d076f2ad1d87dab8d681fb3f3 SHA-256: 0c9caeea3d526bb149d497486e27b8b833319af3008ad500a015426ea58694b9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link disguised as an answer key, which redirects to a malicious URL. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting a phishing or scam attempt. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=glencoe+pre+algebra+worksheet+answer+key In PDF document text
    • http://files.lkhardware.com/uploads/1/3/0/7/130739570/1460863.pdfIn PDF document text
    • http://files.reikidesigns.com/uploads/1/3/1/3/131383924/tatug.pdfIn PDF document text
    • http://files.bucknerinsurance.com/uploads/1/3/1/3/131398292/nokugewek_bonevukutok.pdfIn PDF document text
    • http://files.ginacampbellemdr.com/uploads/1/3/0/8/130814288/3ef3007.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/1/0433/2303/1720/files/91660446317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/20851425857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5131/7408/files/genetics_12th_ncert.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2096/8351/files/pamomeputufarifapunadidan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/81873357433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/31632779214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2957/6352/files/xogezonigigowibujoxivufik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0252/7897/files/lasugobamerisumetib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soreluseloxajakikolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/vixoromofuzesomufaf.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_off0001cd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD01 5624 bytes
SHA-256: 40130c57ca0bdbcedb901c0ae6ae977bf05ca2a37b97641ad37417782ebdcf5c
font_01_sfnt_off0001e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E02D 14916 bytes
SHA-256: 33fa375ccf5262f25a775c2ac7f8c849cdce2316a536edf1e01c9c43cf2d934f

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