Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d787bedcd8f305…

MALICIOUS

PDF

57.6 KB Created: 2020-10-25 23:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6155f094bc74a4eaa5fe73b647dc6837 SHA-1: 119d87093f0d615f5d0f93b70ff2ebded44abd8c SHA-256: 22d787bedcd8f3057daec995fdaef26af48d435fe0fa0aee5b69b268cca92eb3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, forming a link farm, and specifically directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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 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.
  • 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://ggtraff.ru/aws?keyword=history+of+vocational+guidance+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8b96371dae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f8a9ea689b55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f923336862a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5f9338129ae24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f95c762d71d6.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/90599.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/6a5aeb6b3a.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/puzenukaw-giduxojudabawo-pugenilejetebuk-wubelawaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetazino/zilen.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/call_of_duty_modern_warfare_maps.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/anxiety_disorder_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/17246952489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9ea7bb-e233-4935-b903-b781a3b7de40/pexeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d6d4be7-d396-4707-8dce-02115f6fe72c/vutubutomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b37701a-f661-493d-b45d-e32d49674182/55162950427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6433a5-b75b-47df-b8b5-68de6c62b346/woluwipenawuzejolupi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/baixar_dicionario_portugues_espanhol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3544/6433/files/99510553763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8304/5293/files/krups_savoy_coffee_maker_user_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2795/3312/files/rawoduxopo.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_off0000a1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F0 5444 bytes
SHA-256: 8c50bf7de6024c4f36516c887aa64903d4a4e6fc6c43955fe6dedb9d340919a5
font_01_sfnt_off0000b48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 10796 bytes
SHA-256: 3642889a3c555124761244fad985afad18f723d22403f81488604d61ffce51c4

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