Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c0d8e1ff219d34…

MALICIOUS

PDF

42.9 KB Created: 2020-08-23 14:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d05b057ad9ecea2472d70dcd999c14ae SHA-1: 5c2322f7a90b8955be9303187033d43bcb4f0f92 SHA-256: 51c0d8e1ff219d346f3c81d4985714e90617cec2e54cbbee3a3cb4e8e70d6950
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to a redirector service and then to a link farm of other PDFs. This behavior is indicative of SEO manipulation or a phishing lure designed to drive traffic to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=appropriation+documents+of+contemporary+art+pdf In PDF document text
    • http://nifuwulo.reneeyates2math.com/uploads/1/3/1/4/131438641/12d18126d8bd3.pdfIn PDF document text
    • http://wajixalo.libratheater.org/uploads/1/3/2/6/132681947/6228170.pdfIn PDF document text
    • http://files.practicalslighting.com/uploads/1/3/2/8/132815872/27279a5f10c67ad.pdfIn PDF document text
    • http://files.newrockprepacademy.com/uploads/1/3/1/4/131454556/7343666.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/1/0429/7211/9199/files/vuxolamoforonavawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7565/6094/files/33596562192.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1341/3786/files/95894397052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/55211149076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/acsm_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/lolikugomilakefak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/cogentin_davis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/51300385997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6735/9900/files/datopozud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/lit_answers_alternative.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 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_off000068ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 5360 bytes
SHA-256: 6c59092f93e130a4d43bca74f8b7fbc1d87a059e387ada27ed891dd51486a5ba
font_01_sfnt_off00007b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0E 10428 bytes
SHA-256: f148a7609890138a74308b6d427f087cdb8cb3f01ab4b90015bbc07966f23006

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