Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5cb314244256f3…

MALICIOUS

PDF

41.7 KB Created: 2020-08-12 20:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 31d4161441df5e1eb0b38382ba08a1df SHA-1: ecb065e71719e8d61443d12a14a03ccfade0b088 SHA-256: cc5cb314244256f3def3ec0d04654ccfa663cb623de7c8c5e0105f259c8c53a9
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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=organelos+celulares+pdf+unam In PDF document text
    • http://files.attentionruby.com/uploads/1/3/2/8/132814306/213619.pdfIn PDF document text
    • http://files.wppsfete.com.au/uploads/1/3/1/1/131164473/dumemokusipo.pdfIn PDF document text
    • http://bozoko.alternativetherapiesmayo.com/uploads/1/3/1/4/131437736/mulopoxebefew-roraxubebuzisuk.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/1/0433/4708/3429/files/split_adobe_reader_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/causes_of_arusha_declaration_of_1967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/anabolismo_bacteriano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5664/3739/files/audit_trail_in_qualitative_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/arithmetic_and_geometric_progression.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2661/1356/files/after_20_years_story_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/ds2_titanite_chunk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/55310814836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4831/9638/files/nominative_accusative_dative_german_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1687/1336/files/1534344738.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 3

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_off0000641c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 5504 bytes
SHA-256: 1956b30c90077c10308c6dab32a767fbc350ed3cd74a55fe9d6bc2cbd96892d4
font_01_sfnt_off000076be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76BE 10440 bytes
SHA-256: f6fdbd5d230b8016849bf9485593f6d38f32a4eb77043d9d63b5bc5b3ff6b96c

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