Malicious PDF — malware analysis report

Static analysis result for SHA-256 0014e2b24cf8339d…

MALICIOUS

PDF

46.6 KB Created: 2020-10-16 09:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0199d383c25017a6e6bbd36efe33b2a5 SHA-1: edc48cf1330b7c7d714e598ef96e77bad21890af SHA-256: 0014e2b24cf8339de15b7314e0ee2e36cc4feaccf21542f3fdf0fe155d9f6f21
124 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or redirection scheme. One URL, 'https://gettraff.ru/123?keyword=the+immunoassay+handbook+3rd+edition+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text is heavily obfuscated and appears to contain the embedded URLs.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=the+immunoassay+handbook+3rd+edition+pdf In PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/zogebar-kifobuvovovoni-sitipikadimizi.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/5784214.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/fegezinujowopetini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_5f8764f760674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f88f5abe779f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f88c7277492f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f87601744c95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870b32a8fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f88a0681530c.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/1/0491/6962/9350/files/kazudijofirowovujunezoxod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4660/8794/files/how_to_make_black_paint_without_yellow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2965/8283/files/birthday_girl_penelope_douglas_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e4db83-ddde-4b6d-9998-92f4b1a1a98c/nogarof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/126042ba-7834-4679-bfd3-787534e65c94/46490677901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09326abe-38e0-4788-866d-549dc7c27139/39970578.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7661 5668 bytes
SHA-256: 7720be38f5909b49065fad8e7eb4b9feb78b4aad47d0e2e72e8b7facc01cfa96
font_01_sfnt_off00008987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8987 10404 bytes
SHA-256: 6a1fa8355779e02125a7a65922db4cd5a26cec22bc5f1c99d92d9c6fd07c75b3

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