Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b8d4f3882e8e56…

MALICIOUS

PDF

35.9 KB Created: 2020-10-07 14:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b2937dfaf379d92c13b2156aaed237d2 SHA-1: 8086a4d999bcabf99fd94732c771f43530510d03 SHA-256: f1b8d4f3882e8e56dca62bc0566614301c6c4df1cd863ce4077493c8326b9682
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to malicious redirector infrastructure, specifically `https://ttraff.link/pify?keyword=the+bible+is+a+treasure+book+hymn+lyrics`. It also exhibits characteristics of a PDF link farm, embedding numerous links to other PDF files, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and several Shopify-hosted PDF links, suggesting an attempt to drive traffic to malicious content. The ML classifier strongly flagged this PDF as malicious.

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.link/pify?keyword=the+bible+is+a+treasure+book+hymn+lyrics In PDF document text
    • https://site-1038792.mozfiles.com/files/1038792/ruvorefaxalusu.pdfIn PDF document text
    • https://site-1038887.mozfiles.com/files/1038887/doxapegimovavusodaxixuto.pdfIn PDF document text
    • https://site-1039965.mozfiles.com/files/1039965/93883072979.pdfIn PDF document text
    • https://site-1039290.mozfiles.com/files/1039290/76768019265.pdfIn PDF document text
    • https://site-1036636.mozfiles.com/files/1036636/69569010968.pdfIn PDF document text
    • https://site-1044243.mozfiles.com/files/1044243/bokepudoz.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/1/0435/6331/9445/files/poludetagugepanov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/8882/4470/files/13229604942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0375/6191/files/electron_configuration_of_silicon_atom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/4184/0293/files/seniat_iniciar_sesion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0856/4127/files/dimotag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/gas_pipe_sizing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2286/0956/files/operational_orders_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6796/8161/files/bargain_news_ct_used_cars.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_off00004cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF5 5296 bytes
SHA-256: a847b028de28e9babc38a19c08709c0e8ec705c1a88015579b8174b797fe186e
font_01_sfnt_off00005ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED2 10496 bytes
SHA-256: c4b4c30264d0298d18a0e3cdebbb8206bee54e6f1e684e07aa9dba4f5cb81a05

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