Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ed4cd9b5609ea9…

MALICIOUS

PDF

65.5 KB Created: 2020-08-19 06:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4785ed4e961d8db32151bcecf5ef3738 SHA-1: 235c14f949800bf472a18fbe072aac7c38136610 SHA-256: 43ed4cd9b5609ea9de6cffdff129505292cc79bfdeebb87479c070eb0fa5dcee
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 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.ru/pify?keyword=extended+ascii+code+table+pdf In PDF document text
    • http://romufekon.fowlervillebands.com/uploads/1/3/1/3/131379678/b24edb547e94.pdfIn PDF document text
    • http://files.lightsourcechiropractic.com/uploads/1/3/0/8/130813898/8397318.pdfIn PDF document text
    • http://tituwe.music4peace1.com/uploads/1/3/1/4/131453870/1919936.pdfIn PDF document text
    • http://files.hannahwilliamsdesign.com/uploads/1/3/2/7/132741433/lokajulafos.pdfIn PDF document text
    • http://zedudipo.evafbarnett.com/uploads/1/3/1/3/131398102/2834a25321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0462/2630/9271/files/43380109015.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2089/2834/files/aircraft_crash_investigation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6704/7077/files/niwujupagizizuxuzumolog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/99367361369.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/5996/6105/files/1715319637.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/palaeontology_invertebrate_henry_woods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1048/0533/files/dokuxavozakikukiruf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/social_impact_of_globalization.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9797/2135/files/78155991728.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8771 5004 bytes
SHA-256: 8dce2332e16c6e2ead4d0c613272e4cb42fb8b5328e585a6001b112a787ee26e
font_01_sfnt_off0000987d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x987D 20928 bytes
SHA-256: 016e30eec13e5d3cf61fe2e26d0290612af2da6ec39c30f925f4a101ffd175fd
font_02_sfnt_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357
font_03_sfnt_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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