Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c463e26996dbac…

MALICIOUS

PDF

45.2 KB Created: 2020-09-05 14:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4db102933306ce941da7c96e907512e SHA-1: 12af17009909ba16f0ab89286d498a32765beebd SHA-256: f8c463e26996dbac24300c489d437daef60194607e9d6d5bb08f26fc9679575e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.club/pify?keyword=mandated+reporter+law+missouri'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also repeats the malicious URL and several benign-looking Shopify URLs.

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.club/pify?keyword=mandated+reporter+law+missouri In 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/1/0439/3140/2395/files/zudigalomojir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1955/9335/files/anesthesia_secrets_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2140/0226/files/administrateur_base_de_donnes_sql_server.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/4chan_image_expander.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/adding_and_subtracting_binary_numbers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/free_credit_report_uk_noddle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0433/8073/files/tilofawuxisixaxekopifax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/linear_algebra_with_applications_jeffrey_holt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/8314471925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1047/3633/files/tunovowanewisokedakif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2933/0077/files/bootstrap_vertical_align.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/mod_shogun_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/8062/4802/files/27169111404.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53940391871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/pei_employment_standards_act_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3775/3493/files/programme_festival_avignon_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/9359/7848/files/39705010143.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/hanuman_ji_ki_aarti_audio.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_off000072ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FF 5204 bytes
SHA-256: abfaf34968b55d574097907edfbeb919fd4561ddf1c5264e12d173813f1b6a02
font_01_sfnt_off000084b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B4 10352 bytes
SHA-256: dc7eb3c16f1aca3d52d3b0a9fb5f9957516bbe022ca7a1926f2eed929db31aad

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