Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d473e47af7743c…

MALICIOUS

PDF

38.0 KB Created: 2020-10-31 14:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f370e57bfd34fa837c9e47f65c473f39 SHA-1: 9c73508011a4a757ccbc77c6f4b1cd17c17e878a SHA-256: 21d473e47af7743c24b88ae29e1a57f01a158e70a6b8242094f4ce428c770554
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure. The ML classifier strongly indicated maliciousness, supporting the classification of this file as a malicious redirector.

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=equations+with+fractional+coefficients+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f93be322b9a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_5f9a55b4a1dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f8cec0e1dd8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5f9aed1447bb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f962c2ecd13b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405413/normal_5f9b6edcbcda8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5f9b0574d1aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f99f4bb99c0e.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/1/0429/7516/6620/files/rucoy_online_mage_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/tutorialspoint_boolean_algebra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5233/4748/files/dram_of_health_eso_ingredients.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6195/0646/files/repaso_tiempos_verbales_en_ingles_ejercicios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0486/0328/files/memevonuzejopesojakore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21d7ac4-aed8-47d4-b981-70fd35547ef5/84374429788.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_off00005765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5765 5208 bytes
SHA-256: 9ac2ba76fcfe11996fe3af6fb2dc7bf60a26e7e40351877b98a988ac61418026
font_01_sfnt_off00006936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 10004 bytes
SHA-256: 466bd59fefde994c867b286f6050bcf6d9332d82d21b0f592bd5f9848db09137

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