Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a8011a0694b948…

MALICIOUS

PDF

44.7 KB Created: 2020-11-04 04:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 849fe6e6316a54d9e0a66d79bcd3c7bc SHA-1: 91b534c5a83a3ccc168ae3ab913a36ebfa32e11e SHA-256: 85a8011a0694b948bae6beec1de78c1819b5bb6df727858ef3187a462324ab5c
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link disguised as a free download for an 'English style manual'. This link, https://ttraff.ru/123?keyword=english+style+manual+pdf, is identified as a malicious redirector. The ML classifier and heuristic rules strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/123?keyword=english+style+manual+pdf In PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/2085e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_5f9a3545aafd8.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/6683225.pdfIn PDF document text
    • https://nogegonimever.weebly.com/uploads/1/3/4/3/134340032/mumakimoperelugo.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/c0b36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/98428903107.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/79393525181.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/rise_of_flight_the_first_great_air_war.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/behaviourism_by_watson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af032bfb-e0b9-4d38-9a9a-98648ceb6b01/dusupujipugepepezazetovob.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/81408359298.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_off00006fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE4 5420 bytes
SHA-256: b3c5726afc56e407866e93b754ccb30f4cec5a582234ef610f82416d53d4b1c0
font_01_sfnt_off0000823d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x823D 10660 bytes
SHA-256: 427d44b79fc3ac38d4f1ee8f3c236688b43480ac2d6b835aee3105c7821c96a4

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