Malicious PDF — malware analysis report

Static analysis result for SHA-256 550281b478f28b2a…

MALICIOUS

PDF

62.0 KB Created: 2020-08-10 00:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7ec2fbe8d74dfa0e229b69bae06d453d SHA-1: f2b1da327fac7e99d46832a100b85a27b16173b5 SHA-256: 550281b478f28b2ab5ebc1d085364a1b7f34bc3d1c48133515518ccc4169730d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://ttraff.ru/pify?keyword=sprawl+trilogy+pdf, which is known to host redirector infrastructure. The document body contains garbled text but also includes the malicious URL and references to 'wkhtmltopdf', indicating it was likely generated programmatically to host these links.

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=sprawl+trilogy+pdf In PDF document text
    • http://files.balancingacttherapies.com/uploads/1/3/1/4/131408056/8403753.pdfIn PDF document text
    • http://files.smartweddingsandevents.com/uploads/1/3/1/4/131437666/3191024.pdfIn PDF document text
    • http://files.annbrodyguy.com/uploads/1/3/2/3/132303322/d8ad59a16737.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/1/0434/5420/2013/files/java_programming_aptitude_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/how_do_i_find_my_youtube_url.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1165/3279/files/55025233440.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/nixuduwolisinevusinen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/pusanonotimedonoxojadalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/foxesisusig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6636/7895/files/3._5_character_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/52630641669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/90243122714.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2630/0575/files/vebomusibisutukabisafuzu.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 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000784d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784D 19804 bytes
SHA-256: c78bae0c109207b2833d8693b60955fcbb7ef9ea27b0daccd44d3f4bb48ae242
font_01_sfnt_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 5328 bytes
SHA-256: ca39af2fa974a2c3f229f73a6873263365d41b54cf193fa5a5211447809d280f
font_02_sfnt_off0000c8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E7 10060 bytes
SHA-256: c027470e054dae0255b39613dc5ce17c3a53f233cb6cefc514c1fff259e365a9

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