Malicious PDF — malware analysis report

Static analysis result for SHA-256 498775d5c21e4988…

MALICIOUS

PDF

52.7 KB Created: 2020-08-09 06:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6fc6be94b73f648ed78de8e755b78b01 SHA-1: 615fa8717241c976693bb73b2b5ac7021e041a71 SHA-256: 498775d5c21e4988ac1f80f03ccdc84bccc12a6a4bff4a672690589756aeab12
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF SEO link farm. One of these links, 'https://ttraff.ru/pify?keyword=frecuencia+cardiaca+pediatria+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting the primary purpose is to direct users to malicious infrastructure. No scripts were extracted from this sample.

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.ru/pify?keyword=frecuencia+cardiaca+pediatria+pdf In PDF document text
    • http://files.westcroftcommunitycentre.co.uk/uploads/1/3/1/8/131856646/xaxujojijuxu.pdfIn PDF document text
    • http://files.danaschechter.com/uploads/1/3/0/7/130740190/105696b0267.pdfIn PDF document text
    • http://files.cochranetotaltree.com/uploads/1/3/1/4/131413718/bajazujixaxe.pdfIn PDF document text
    • http://josifejol.luckyhensrescue.com/uploads/1/3/2/8/132814930/lujamegomewuzi.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/1/0435/7272/3875/files/abolishment_of_slave_trade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/dadifepowotosoruxejoje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/29078164593.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0311/7721/files/attestation_de_fin_de_formation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7085/7124/files/mitezaxojomekowojuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2477/6354/files/kunuduziwipifadodixu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/32172481104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/93942180822.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/kejezavilatopawufux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/23896446157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/5308407949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/41410808115.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/77886554917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/76956317421.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 7

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_off0000904c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x904C 4896 bytes
SHA-256: bca432ad35443c0ae2387159eb4884a96518cbae257ac41fa24d25559f87c6a0
font_01_sfnt_off0000a107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA107 11252 bytes
SHA-256: 91dcdaf0f4f9748097645c37024f89ad0e4254955d93a0b959aab38d9c7da7eb

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