Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff7d22b48808f1…

MALICIOUS

PDF

48.1 KB Created: 2020-09-17 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c6c663110929934e055c225d5df97d64 SHA-1: 323e5b83ee68e03d1a2085ec3e4c6ec3f16ee1bd SHA-256: 0cff7d22b48808f136c8d292d9ad5ae4ff10e5caee4c9443f20306e86886858f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=trimble+business+center+4.0+manual+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c75e1e-8e41-449d-b18a-94da43d0a3e8.filesusr.com/ugd/b6bf5b_58d74c709d014c80a9dd71fe3c59bc00.pdf?index=trueIn PDF document text
    • https://e9ac3b10-dbe7-4f98-8ffa-e9617ae76cd6.filesusr.com/ugd/1cc777_5d1a8c35e47946e38050699e4b40a6ae.pdf?index=trueIn PDF document text
    • https://0928cada-0a01-4108-a85d-657ab503b615.filesusr.com/ugd/f9d4cd_b467020b52694ee8b5cc4bf0b421acee.pdf?index=trueIn PDF document text
    • https://9091d0a7-b944-4d9c-aa01-574cafb97f7b.filesusr.com/ugd/1e32c2_ddf334b54a8f47b9876aa5d2935b9cef.pdf?index=trueIn PDF document text
    • https://6d22395b-f3d3-4493-a68a-a9a752559325.filesusr.com/ugd/1a1092_85034be162f3402b9a639d454be3b202.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/widutada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/causality_models_reasoning_and_inference_2nd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/air_conditioner_repair_training.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/calendario_feriados_2019_chile.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/45164081426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1733/8005/files/http_azaforum_com_patchs_2058w.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/20856708262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7298/6774/files/limits_of_functions_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/4089/1029/files/thaumcraft_research_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/serge_lang_linear_algebra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1959/0040/files/chiller_hitachi_samurai_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/63283899667.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7239/6193/files/89293054503.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2C 5400 bytes
SHA-256: a931ea5592c044f7dd0d3550738f04f24f05b8cd6f6521e1dbe63e778592f74f
font_01_sfnt_off000081c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 5652 bytes
SHA-256: 2e876807ab8e5217ae413ba403da066b1f1706ebf77e427b37a2afdd0fb79234
font_02_sfnt_off000094e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E1 10740 bytes
SHA-256: a3f667df5daddfc1d9df44736d368af31f780194ded4d1fbe481a2c7a96ad0e0

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