Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bf893985cb94d3…

MALICIOUS

PDF

45.6 KB Created: 2020-08-11 15:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 660410c692b89d4293fa71c3459a2380 SHA-1: b5d277b0abe260198123e42bffb598b272a65fb6 SHA-256: 62bf893985cb94d32945a98a43385fceb07c9917a86bc2a305b82e92a843d80f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ttraff.com/wb?keyword=unit%2032%20networked%20system%20security%20pdf', which is flagged as malicious. The presence of a link farm and a high ML classifier score further support the malicious nature of this document, likely intended to lead users to harmful content.

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://ttraff.com/wb?keyword=unit%2032%20networked%20system%20security%20pdf
    • http://gobetefi.aubrey-annedavis.com/uploads/1/3/2/3/132303382/2291275.pdf
    • http://files.marylynnswenson.com/uploads/1/3/1/4/131438651/sokejofomuso.pdf
    • http://biwuroko.riefcanada.com/uploads/1/3/0/7/130739561/dilusorob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/36678479290.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/the_economist_may_5th_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0321/files/buku_agama_hindu_kelas_10_kurikulum_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/kijugalebosuxene.pdf
    • https://cdn.shopify.com/s/files/1/0438/2287/4781/files/basilicata_guida_turistica.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/29286271023.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/97767951896.pdf
    • https://cdn.shopify.com/s/files/1/0436/9950/3254/files/career_management_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/9168/0666/files/applications_of_artificial_intelligence_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0458/4355/files/kijutazalanokimiburer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6799/7344/files/95196903789.pdf
    • https://cdn.shopify.com/s/files/1/0444/3645/5591/files/cycloalkanes_nomenclature.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000651c.bin
59dd6ec6a94b8443e7c60598e99b34a93b6022ae99131f6995533117dac297b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 5484 bytes
font_01_sfnt_off000077cd.bin
6c38ebe579f1f7bf9109ee43a63097207547e7affc0d65e529dd566fc614456e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77CD 10364 bytes
font_02_sfnt_off00009b49.bin
781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B49 4324 bytes

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