Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0aee0a0572a54…

MALICIOUS

PDF

31.9 KB Created: 2020-11-06 17:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5af6dabff45c9bcaf73cbca8ee0309a3 SHA-1: b9e3992de47214fce685872a85b69512d22bca80 SHA-256: 4be0aee0a0572a54a5beecfff27cb05c5c8642742fa6d53636e9f4d663de06c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many pointing to other PDFs hosted on disposable or SEO-focused domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=the+messenger+lois+lowry+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5fa52affc0b00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403537/normal_5fa21dd97336a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f9765cc01a56.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/d2e9bf27-da89-45e1-853e-67ec558d1523/sutozigosujufek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1a49f46-5537-4027-a90e-9a8e0d3a004c/shiba_inu_puppies_for_adoption_in_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5437d7d3-21d2-41c9-8938-586eb033ad08/skyrim_hdt_collision_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2c9255-3550-41d2-8160-f7dec806f559/49554752604.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://gukoxawe.files.wordpress.com/2020/11/65220727398.pdfIn PDF document text
    • https://bojugese.files.wordpress.com/2020/11/30814460102.pdfIn PDF document text
    • https://dusurujadexo.files.wordpress.com/2020/11/busirevomajakere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8482e82c-303f-4ff2-a76d-067081f203e3/major_lazer_lean_on_mp3.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/nozemapopumetuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58991ca-5185-4dcd-bf60-13b3ae611a81/34357072037.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_off00004548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4548 5240 bytes
SHA-256: efc8ef0f1f3f0b9ebb597bbb2b1464537f58727bf37c07a81650964f8df4da8d
font_01_sfnt_off000056ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FF 8140 bytes
SHA-256: 7e407a8604ef70eaefb34667e60ccfd969650171e43d44b49ba11655164a440f

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