Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8253d78a251450a…

MALICIOUS

PDF

36.2 KB Created: 2020-08-03 00:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6f76f27cafee63cdcdee1b7f7712f4db SHA-1: 2a66eadba21b98c932b98dc6ee29304882d233c7 SHA-256: f8253d78a251450af4fbfb640998df51a01b23f19e593f26f95bb463f0e6ea5f
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the text "Hayward pool pumps manuals" and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. The presence of numerous PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for malicious content.

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=hayward+pool+pumps+manuals In PDF document text
    • http://files.heirtothechrome.co.uk/uploads/1/3/1/4/131406434/dumurusasujebotud.pdfIn PDF document text
    • http://files.charhdof.com/uploads/1/3/0/8/130813132/eb5ae928848523a.pdfIn PDF document text
    • http://files.morethansoulfood.com/uploads/1/3/1/3/131383514/fb31e59a8.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/1/0432/0778/6657/files/30537946377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/download_animorphs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/48340395639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/99794816252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/sigukosudubesajofopu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/poxoxetunolo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/39945478740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4505/1797/files/fijetub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/33442662606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/puvofadajafiwerosen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5023/6064/files/talifof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/1617710699.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
🗂 Part of campaign: charhdof.com 3 samples

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_off00004db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB5 5260 bytes
SHA-256: e081190dbdde4f05954bc6835f8a45bf31d45f69afa6148b92cf266ce17a9fae
font_01_sfnt_off00005f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 10744 bytes
SHA-256: b83748b640c6eb68a2a1d4ec7ff4417a1b5691517ff044b6669b25ee7074e97b

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