Malicious PDF — malware analysis report

Static analysis result for SHA-256 5869157c3f52fb19…

MALICIOUS

PDF

43.7 KB Created: 2020-11-02 20:15:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: afc80dad8a55224ac8425c15030c92d7 SHA-1: d5d47fb4d3e96e60dd9af97cf1705c2724ec8ab8 SHA-256: 5869157c3f52fb1927bfa4737403a5540010bbc1a4e47f647ff2e69bb3ae84a4
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://gettraff.ru/aws?keyword=what+is+your+current+notice+period+means, is flagged as a malicious redirector. The document body text, though obfuscated, also contains this URL, suggesting a lure to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure exhibits characteristics of a link farm on disposable hosting.

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/aws?keyword=what+is+your+current+notice+period+means In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87a5495ef6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f8bb3b863c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f8d5b32e61fc.pdfIn PDF document text
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/b7b1bd7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f8b6ab7e5eae.pdfIn PDF document text
    • https://viwawisigox.weebly.com/uploads/1/3/4/3/134342504/lozadigo.pdfIn PDF document text
    • https://moxowikoxub.weebly.com/uploads/1/3/4/0/134096036/jipifarafenewim-sunoxagar-kaxunurerokel.pdfIn PDF document text
    • https://kigibituridugu.weebly.com/uploads/1/3/4/3/134352406/sakimagipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8f614995f9e.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/ae41f5f86f004d.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/9e1545ec01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_5f9a6398668b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fdefc5-84ae-4c71-91e9-1ab130434894/45547521149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33150d71-299d-462c-ba5a-9aa3e6c71f28/cock_o_the_north.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc29340-256c-457d-9b06-baf67d01a76e/1699269465.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_off00006ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 5396 bytes
SHA-256: 18a99d40ee0394388f0264b0ef5958a71b4cb22fd8966b4d320988f30405ff20
font_01_sfnt_off00007cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF4 10884 bytes
SHA-256: e3d962cd8c01abbc69ca4a81be68d30239e5f187e25fa6bbda2a2ac9c8e3bb4f

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