Malicious PDF — malware analysis report

Static analysis result for SHA-256 a829f8c37f5159e6…

MALICIOUS

PDF

44.3 KB Created: 2020-08-11 00:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8b45400fb15ba6525bd402a53ea5fcf9 SHA-1: 73101eb5a2c070c96956127feb5784c80707aaad SHA-256: a829f8c37f5159e602101a27cf8709d639e0b24eef93003872a80ca5193914e2
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The document also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=ophthalmology+books+pdf+free In PDF document text
    • http://files.hilltoppreschoolrva.com/uploads/1/3/1/3/131383575/vurududopus.pdfIn PDF document text
    • http://files.zstreetbandorlando.com/uploads/1/3/1/3/131379276/f9b888af.pdfIn PDF document text
    • http://files.sarahkramerharrison.net/uploads/1/3/0/8/130814205/gejader-givajiromuw.pdfIn PDF document text
    • http://jogorog.bringitonline.in/uploads/1/3/0/7/130740069/40ba9074ca.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/1/0437/8791/1319/files/braunwald_valvular_heart_disease.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6572/7384/files/fodesuliluvojiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/sejifoxotenimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/19985943067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/xufujerunoxedavire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8165/3655/files/doxupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/55292225529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7794/1913/files/kuduzupugimam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/27046855725.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2823/9768/files/electronic_devices_for_analog_signal_processing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/webonu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.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 4

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_off00006e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E13 5788 bytes
SHA-256: 8b699b944e0c661b3cf0f1c1962f9bf09b5e5572e3ba45871757baf8504dd898
font_01_sfnt_off000081a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A6 10096 bytes
SHA-256: 0ca6b38ce1c32ccdd6809045e7938b43f64698f12b23ee58f6dccdf60f377cbe

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