Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b40a1be466bddeb…

MALICIOUS

PDF

50.4 KB Created: 2020-11-01 16:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d758e2ade77c37ef59d9a20f5b4b8f2c SHA-1: d3788b8db404e4738569e9706b8ff257e59e736f SHA-256: 2b40a1be466bddeb33aaa4991545d6386b2091f2ed56481151a5b2a5edc9fe01
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to direct users to potentially harmful websites, possibly for SEO manipulation or to host phishing content. No scripts were extracted, but the presence of numerous external links points to a malicious redirection scheme.

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://gettraff.ru/strik?keyword=fleming+middle+school+grants+pass In PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/299afe4af411e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5f9419362324d.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/zeposeri-razosopefuvizuw-dogima-kevulijubumor.pdfIn PDF document text
    • https://tigafuxofezez.weebly.com/uploads/1/3/4/3/134363272/1ce090735c2c531.pdfIn PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/7901005.pdfIn PDF document text
    • https://vemewibikem.weebly.com/uploads/1/3/0/7/130776349/9253134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_5f9958c99b685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_5f9630c8b00d2.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/4482252bf2fd08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f98396094830.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/mumemuz-pegeluripe.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/1/0499/4996/6489/files/mhw_timberland_troublemakers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7880/4154/files/mekegofuvevanorunupefaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef5c415a-f03e-4063-95cb-6f42e5c1e1fb/vapuguwemelipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c7127c-f3cb-4285-85ba-59253319b40c/kokuvelijafewem.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_off000085b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85B4 5444 bytes
SHA-256: 48e38f0b16844aa1337172d1f846a5e8a3a5a4ec880f1f3a4ad1ab8c5cef6e70
font_01_sfnt_off0000980d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x980D 10652 bytes
SHA-256: 6d683a0f0f9349f6484fddc9c6394f8c1b45bcc46ab217065932add4f955a34d

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