Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66f025f6338f594…

MALICIOUS

PDF

37.9 KB Created: 2020-08-20 20:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: dba5037deda20d5acffeb6d084ce90f5 SHA-1: 888f264548dd74f33acca9288f681f8acd765450 SHA-256: c66f025f6338f594f0bbed85b057c3477a9b58e38618ab5e8bd2d431859bf66f
194 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a known malicious redirector, and numerous other links are embedded within the PDF structure, likely serving as a lure for users to click on malicious content. No scripts were extracted, but the PDF structure itself is the delivery mechanism.

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=rainbow+kitten+surprise+live+performance In PDF document text
    • http://files.laisaycheese.com/uploads/1/3/0/7/130775062/8494142.pdfIn PDF document text
    • http://files.brandynoir.com/uploads/1/3/2/6/132695663/wesasisuvume.pdfIn PDF document text
    • http://setuwiler.jillrumleyart.com/uploads/1/3/1/3/131398547/dikuvopimewobolut.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/1/0434/6019/8557/files/wuzumesixufufukosi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4257/0401/files/toefl_junior_mock_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/9506/8565/files/rangkuman_biologi_sma_kurikulum_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/67132426937.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/19746967784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8262/0834/files/16508238525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/acceptable_forms_of_identification_for_flying_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/4223429326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/49910339251.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8034/3961/files/51028516601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1988/7001/files/wusavoniwofebirekesixe.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 6

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_off0000553f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553F 5524 bytes
SHA-256: 8eb31002db8efda3d987b1a2eb046552f952960267a5476ebb07c36f47eb4a75
font_01_sfnt_off0000680e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x680E 10128 bytes
SHA-256: 256f845407d766ac235f444467d48994470af4dae3f7a35a51fd0919d0d5a33b

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