Malicious PDF — malware analysis report

Static analysis result for SHA-256 919f5da6395b2148…

MALICIOUS

PDF

43.2 KB Created: 2020-11-01 11:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6212fefad5a44ff01326ffe40e1727cb SHA-1: 1300c220fed99574537f2431c8a2647927ac3629 SHA-256: 919f5da6395b214887744a64f94853cc4d2345b84173d630003355a0cb4057af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm or content hosting purpose. The embedded URL https://gettraff.ru/aws?keyword=the+dorset+school+dorset+vt is a primary indicator of malicious intent.

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://gettraff.ru/aws?keyword=the+dorset+school+dorset+vt In 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/38671412-aa5f-47f5-a053-fccfe0feda6e/48427424249.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3643/1279/files/neverending_story_stranger_things_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d451071a-46d8-4437-88e7-50dadc1d0d28/3234823172.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8696/3622/files/manualidades_navidad_palitos_de_helado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e71f9d6-5cd8-495a-86be-11337dba619d/28321393667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6877f2b3-7157-4918-bd9e-bd0ebfa9c5fb/new_home_guide_maryland.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/give_him_the_highest_praise_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9689/4357/files/golden_retriever_lab_mix_puppies_mn.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/absolute_heat_flat_iron_reviews.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/3005/8436/files/27780522446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2888/7714/files/vinasayas_weight_loss_free_download.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_off00006b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 4824 bytes
SHA-256: 7a5fc345a89e6444c62b85c6518ded94524428493b2d56a59ddc0470d5f281bd
font_01_sfnt_off00007bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC3 10920 bytes
SHA-256: 3fe54a1d63654d03d8a506eec970bd029e1770ba90387ab4862b75ca4252bb3d

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