Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fbe25bc881ee25…

MALICIOUS

PDF

51.9 KB Created: 2020-09-08 07:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f0043bfcde5621ecb863f9063906e172 SHA-1: 30ade2194d71ebefa86d1afe9feeba423fcf9a7e SHA-256: 31fbe25bc881ee255a4e02697cb4f1845ce1e873293e1b84ee98710b857a9aed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many of which point to external PDF files. One of the primary links redirects to a known malicious infrastructure. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing sites.

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.cc/wix?keyword=acidose+lactique+associ%25C3%25A9e+%25C3%25A0+la+metformine In 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://static.usrfiles.com/ugd/b8c837_455e295a74104e64b1b901251d27e431.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/96768c_543e64139fec4f318b7797313665be86.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1cfe37_2d961d343d9d49ea9a62797ad4a056f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/47b1e8_911ba8efbf8a4341a8c18e4e120b7ef2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/754d94_6af1efc4df7d4e428b7d799afbd046bd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c836c3_a32bdcfacdf14711b9c2640d67823dc1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7198c1_2a1c4ec7ab224be0905d338c1307a8f6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/07ef24_2803b57b8610407e89ac70603fdc64ce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/868f76_2a99c2ba0f114de4aff138d7b45974e1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/group_by_multiple_columns_in_crystal_reports.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7176/6681/files/lopafamevolifedobexekugaz.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d4a9d6_1e9b4c0e8ad34f3ea25852a4bdafffcf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/64d889_7117a58fb95242b09ea29277ddce7feb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d1bebdb690de44d984c51a658bf68c36.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/fa6f14_6d0c52eed3b94d32851ed307f5b58ea6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f80014_b7cb7c2831924333ae2125020d01107b.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79FD 5540 bytes
SHA-256: e7fcc1c78423fa65781ffe03b3aa35acc85097086873dcb63f3aec2f5e5836ae
font_01_sfnt_off00008bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 12176 bytes
SHA-256: 1f948d9404aa241b4f97bfce66100988518e23403bac9df910debdae866cdb5b
font_02_sfnt_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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