Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a27d274f0806a89…

MALICIOUS

PDF

44.5 KB Created: 2020-10-16 18:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cb8c09232ac2e517aa28f2c1cf3ce1f7 SHA-1: 2cc0d0166a1a7f7fce5bcba60dee17416ca189d8 SHA-256: 7a27d274f0806a89cb0b1bb03b42207a42789eafa272a53f4529687e7795d39b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with several identified as pointing to known malicious redirectors or disposable hosting link farms. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to external, potentially malicious, content.

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.
  • 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://ttraff.ru/123?keyword=banished+game+beginner%2527s+guide In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/9845282.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/luxuzolajewebe.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/8621564.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/1302795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f87bd937f5f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f87e7e9af9de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f88db13be251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f88f9f0741c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_5f8755ed440d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f874dd9aa810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f872f1aafcb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f87b9a884307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f87fa0521b47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f8994b39e070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f8988e325724.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/newiravuwavuli_powuzewukanelo.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/sofiwibipul.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/1/0483/9515/7662/files/geometry_congruent_triangles_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/58527417234.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9272/8226/files/parixidapubugilodun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/3709/7625/files/pusazaluruvojabebezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9151/8374/files/the_mis_education_of_the_negro.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_off00007089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7089 5428 bytes
SHA-256: 37c6f067953ecfdd538d01350f05d2776f65ba2ef9ae8a675884f26ac5e1fc28
font_01_sfnt_off000082cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CC 9796 bytes
SHA-256: a6eeb42a63a8548386228befdf2399f96fb02a303eba361c4d757cfb2bc8204b