Malicious PDF — malware analysis report

Static analysis result for SHA-256 433dd75fd4ef5f32…

MALICIOUS

PDF

43.4 KB Created: 2020-10-15 18:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 08261dafdc3f1f8d3bfb30837c9e6bf6 SHA-1: 646876817b351a23f089a6824453345b2ccad0af SHA-256: 433dd75fd4ef5f32065a826f7bcebd335c85c40a0ac66d723b3506d8b4a3b99e
194 Risk Score

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://gettraff.ru/123?keyword=nature+and+nurture+of+intelligence+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f873fef1eb05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f879d87b8f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8812508180f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f877050956c6.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/tomefibejoguzipif.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/189724bb8fc03.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/tevow.pdfIn PDF document text
    • https://site-1039266.mozfiles.com/files/1039266/13369908599.pdfIn PDF document text
    • https://site-1040032.mozfiles.com/files/1040032/gawiluveku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f87702bde252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_5f88673c5766e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f87659689cb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9526/8770/files/guitar_rig_5_player_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8155/8933/files/sotinulimarajopevemezaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/icd_9_thyroid_cancer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/gowotivuwiruvujolovelavax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/locating_epicenter_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2569/6421/files/xorepotozixebibimixedum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9884/7428/files/83736856622.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7F 4996 bytes
SHA-256: f20f270bb30772502aa2d66e10e58cc93a53e8c9cebe7e307a803396fbe0d011
font_01_sfnt_off00006f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8F 10104 bytes
SHA-256: fe43fc99a1c0ac48e3fe40f4e87940b1c8ae714b604f1ff01f55c25408bbd645
font_02_sfnt_off00009228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9228 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378