Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f39e2cd853a933…

MALICIOUS

PDF

37.5 KB Created: 2020-08-12 22:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 738ff03baaeb48d11dc43543e8330bc9 SHA-1: da92cef35258ec841c400322f4089fa077b438ac SHA-256: 51f39e2cd853a933805ed72c494e5d4649695bb0211ae8b12d2b5d0f83eda4c4
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with the primary one leading to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, appears to reference 'Ring doorbell pro setup manual', suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and distribute 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/wb?keyword=ring%20doorbell%20pro%20setup%20manual In PDF document text
    • http://files.minkywoodcock.com/uploads/1/3/1/6/131607063/8d56dcc2fe9e99.pdfIn PDF document text
    • http://files.buffalobrewinghistory.com/uploads/1/3/1/4/131454352/e0ffaecea.pdfIn PDF document text
    • http://files.clanchildhealth.org/uploads/1/3/1/4/131452997/dagewugojoma.pdfIn PDF document text
    • http://files.saratoganykennelclub.com/uploads/1/3/1/4/131455141/pamufo_funeg.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/1/0429/8106/4853/files/55270488627.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/adobe_photoshop_tutorials_in_urdu_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/thomas_calculus_12th_edition_solution.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/sakomujivosuxuluzumogege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7753/3856/files/pinivewal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5528/4378/files/tovutimifurikes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1356/2787/files/rotation_90_degrees_counterclockwise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6612/0602/files/learning_spanish_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/key_and_peele_east_vs_west.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_off000054f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54F5 5424 bytes
SHA-256: a8ca4f2d01813616a5045591109a6cc963631e8abefbfcad1704634083970f38
font_01_sfnt_off00006749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6749 10184 bytes
SHA-256: c5a977f9edcfbe3d90f224dd7185a50f9402e63b71110607a6d5b46aca79115a

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