Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18d45619dccd373…

MALICIOUS

PDF

70.9 KB Created: 2020-08-19 21:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c840da9a9bae103c5c6c243bef4e9a87 SHA-1: 93e9ffa07e02734acc3dfef0c184a4e50872b41e SHA-256: f18d45619dccd373eb998f990af06de90ba84a28e78a429432dc36b2f87c2b99
194 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. The document body, though heavily obfuscated, contains references to the malicious URL.

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=apache+poi+word+tutorial+pdf In PDF document text
    • http://files.ccw-couchscedarworks.com/uploads/1/3/0/9/130969489/pipofuk_narozuwis.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/1/0429/2290/1663/files/sony_vegas_pro_14_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3279/5541/files/bullet_raja_full_hd_movie_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/jumoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/census_data_center.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/viwezevajerexetijozilokig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/23563352342.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/spring_boot_jdbctemplate_batch_insert_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/9487/0935/files/bd_map_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9956/8795/files/67684251308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pajovi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/91281144530.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off0000d9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E8 5144 bytes
SHA-256: 4cbf621c950e69f94c48a936aebefed419dce5d4504f9744d5cf8af14fe4c0b4
font_02_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 10096 bytes
SHA-256: d840598689a63cf6caf4d43aed2e0ec056be38fafca688b56cd3def2c8a7c487

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