Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b947fa04a82021…

MALICIOUS

PDF

48.9 KB Created: 2020-10-01 08:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7707a49bf31742f8ca71db55fcf5eea3 SHA-1: 848d87f1c5022a7b973ea3725be531df00df03a8 SHA-256: a8b947fa04a8202185c5c1e0dec97f51b18d8b7314c5230682a69e771dccd344
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, includes a URL that matches the redirector heuristic. The presence of a large number of external PDF links suggests an attempt to manipulate search engine results or direct users to malicious 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://cctraff.ru/strik?keyword=movimientos+articulares+de+la+cadera+pdf In PDF document text
    • http://files.umc-amherst.net/uploads/1/3/1/3/131380445/20ad282df9.pdfIn PDF document text
    • http://kogoritut.gbnfootball.com/uploads/1/3/1/6/131606490/7bbd95ce19eaae9.pdfIn PDF document text
    • http://files.marketingforimpact.com/uploads/1/3/1/8/131856046/584756.pdfIn PDF document text
    • http://ranur.venusdirections.com/uploads/1/3/1/4/131406592/2570720.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/c4caf073-994b-4dc5-bce9-6a7466ef4258/taxosewasudopiwobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26350555-a40b-47c7-a929-33125c18b500/nirabarupirisabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b7136b-ffc8-4c73-a87c-8e96457eaa2a/95234823946.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/besafivabujodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9626/7165/files/sql_interview_questions_for_freshers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/musculos_de_la_expresion_facial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/bariziw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7596/6878/files/obstructive_jaundice_in_children.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/42074741899.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4023/4917/files/76487374776.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0469/2859/3051/files/64939138157.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5662/7866/files/kokepuni.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0331/4080/files/naderumimekotajala.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_off00007d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3C 5368 bytes
SHA-256: 6fb39f1dc8a5f7d212e72fbb641465768cc1c98548c3a4671a012c0bce17460c
font_01_sfnt_off00008f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F75 11520 bytes
SHA-256: c822dc42b343a5fc7e932635f8f8c446c0e0be09d478b11e0164b125e70cb5f3

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