Malicious PDF — malware analysis report

Static analysis result for SHA-256 664d108a03e49cb5…

MALICIOUS

PDF

52.5 KB Created: 2020-08-26 08:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3fd019b7dc9cbcf0e90c9795480c5f SHA-1: 4d0f6b1647d9867919ac71015f5b3a888e836934 SHA-256: 664d108a03e49cb5bec17f56390947f089190442cb45f675c82307a3446d80f8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO spamming operation. One of the primary links, 'https://ttraff.ru/pify?keyword=libro+de+metafisica+pdf', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=libro+de+metafisica+pdf
    • http://wujesi.brianchovanecknives.com/uploads/1/3/1/6/131607984/2853900.pdf
    • http://naxokafe.wiggleroom.org/uploads/1/3/0/8/130874304/tevigikagojibawi.pdf
    • http://voxatonot.csscw2019.com/uploads/1/3/1/4/131483083/12bda.pdf
    • http://files.donnavarnsosteopathy.co.uk/uploads/1/3/2/6/132695582/0d8a572.pdf
    • http://files.drewryfarmsberries.com/uploads/1/3/1/6/131606431/180378.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/9909/1098/files/dr_bruce_lipton_biology_of_belief.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/gyproc_false_ceiling_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0429/6287/8618/files/42579538559.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/complex_variables_and_applications_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/tidagivagebipozum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9645/7884/files/35489969667.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/xewapalabevekigofipo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/progesterona_amenaza_de_aborto.pdf
    • https://cdn.shopify.com/s/files/1/0429/5675/1002/files/96912182858.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/lobeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/3886/6584/files/dbt_skills_training_manual_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1812/5465/files/golosa_workbook_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085b6.bin
95e84afae5ac81cd5bd733a311461e5ac9a678b2bd3d90cd8e94f35c2fa19b1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B6 5348 bytes
font_01_sfnt_off000097c9.bin
235c1dbd4c9144a1cc495080818ab61b887f117680e8c6da6bf646be781dd608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97C9 14080 bytes

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