Malicious PDF — malware analysis report

Static analysis result for SHA-256 43464c3c1ed6746f…

MALICIOUS

PDF

43.8 KB Created: 2020-08-14 18:39:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d62a64d61d06bef7b302b40c302d4fcb SHA-1: 3ae382c690a7f134dd4f9b43bce815cf233e4db9 SHA-256: 43464c3c1ed6746f6a8e2721e2ced14110c6ab7481cd3e9842354259b26ca06c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One prominent link, 'https://ttraff.com/pify?keyword=fields+virology+pdf', is identified as a malicious redirector, indicating an attempt to lead the user to harmful content. The ML classifier also 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.com/pify?keyword=fields+virology+pdf In PDF document text
    • http://debowe.nwtf-wi.com/uploads/1/3/1/4/131483492/nazijesawulokok_duxetoxapo_kalol.pdfIn PDF document text
    • http://kedogikuw.khursigaralab.com/uploads/1/3/2/6/132680813/438136.pdfIn PDF document text
    • http://files.kwikstand.com/uploads/1/3/1/3/131379801/4124898.pdfIn PDF document text
    • http://files.beckleyflag.com/uploads/1/3/1/4/131410479/51b94d.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/1/0432/0074/1531/files/tigijebon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8973/1479/files/smd_electrolytic_capacitor_datasheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/jurnal_retorika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/prepositions_list_with_examples_sentence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/3877394312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5713/5257/files/sepifudikego.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/acupressure_points_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/arc_info_gis_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/wozukeleteronavezaluk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/70678512488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0947/2669/files/36389733998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0632/7975/files/volesezawajujatumupuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1601/2455/files/zopexoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6063/9384/files/copy_paste_smiley_face.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_off00006ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA0 5116 bytes
SHA-256: f9cfb7b6dcc8a04339795aaafcd2df3fb808b16c221c5fab943e79dc3114e7b7
font_01_sfnt_off00008028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 9876 bytes
SHA-256: f526d0d365a8097208df7c27e6bde9e6408a05ddca8789c2faefe6fb0e16adae

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