Malicious PDF — malware analysis report

Static analysis result for SHA-256 257f421d8d5d6c2d…

MALICIOUS

PDF

45.0 KB Created: 2020-08-01 07:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 71850442e4380a51758f5a6f579045f5 SHA-1: 18dfc1a3530053d26ce3c1877d479d2d634de232 SHA-256: 257f421d8d5d6c2d3114d419dcb1ecd94859f8b87763e4e592d9086ce38b7587
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of external links, a technique often used in SEO link farms to distribute malicious content. One of the primary links points to a known malicious redirector, ttraff.com, which likely serves as a gateway to further malicious sites. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

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=heroku+push+master In PDF document text
    • http://files.quintessencesilk.com/uploads/1/3/2/8/132814958/9347086.pdfIn PDF document text
    • http://files.runwildlivefree1.com/uploads/1/3/0/9/130969262/6084774.pdfIn PDF document text
    • http://files.nafsijewels.com/uploads/1/3/0/8/130814492/kuzomelupujafa.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/1/0433/4295/4661/files/zakarofelijixafigapewosoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/35742296002.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/21508801053.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8944/4510/files/rojetozeripujabinoma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/vuzadiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/bunipiwaniselisizenuvo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/newifizutuxutotopozedesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/kipisoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/3454340697.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6544/9371/files/nejireponazasimapekas.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 8

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_off00007469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 5052 bytes
SHA-256: b38e443b58da9fa0700b55f9dbd461bbf297934925dba4bae37e0c970d25beb6
font_01_sfnt_off00008563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8563 10088 bytes
SHA-256: 3712852d23331a15ddeab4487324edd65b9dae5070dbae63ddc82af06ce16e22

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