Malicious PDF — malware analysis report

Static analysis result for SHA-256 340bf7e3815c10df…

MALICIOUS

PDF

45.2 KB Created: 2020-08-09 02:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d02ef874ee39b4eed7e7b942ad12954a SHA-1: 9378851782da7e3772762d46cd46b8392d46889e SHA-256: 340bf7e3815c10df4fbb31c4c2f4902880e35d83f9a6b3091ab81590dd8cb090
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirectors. One prominent URL, 'https://ttraff.ru/pify?keyword=si+s%25C3%25A4tze+franz%25C3%25B6sisch+%25C3%25BCbungen+mit+l%25C3%25B6sungen+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar URLs and the authoring application 'wkhtmltopdf' suggests it was programmatically generated.

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=si+s%25C3%25A4tze+franz%25C3%25B6sisch+%25C3%25BCbungen+mit+l%25C3%25B6sungen+pdf
    • http://files.thetaitungteacher.com/uploads/1/3/2/6/132695257/sexixetegaboke_bebevipox_wapab_jezidonidukan.pdf
    • http://files.spaghettiplay.com/uploads/1/3/2/6/132681516/7365523.pdf
    • http://files.keyconceptslearning.com/uploads/1/3/1/1/131164456/xetugofaganeved_lobof_kuwatezev.pdf
    • http://dejawoju.stephanieflear.com/uploads/1/3/0/9/130969352/wuwujuxewovumutagid.pdf
    • http://files.chesapeakeorchestra.org/uploads/1/3/2/3/132303118/1feb61dc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/difference_between_adhesion_and_cohesion.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/79215741363.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/pokemon_emerald_pokemon_locations.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/bodarazubopafulo.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/85893311525.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/wivena.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/lavaxagejunozop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0434/6285/2761/files/php_close_tags.pdf
    • https://cdn.shopify.com/s/files/1/0433/8742/0835/files/bangladesh_bank_previous_job_question.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/critical_care_nursing_diagnosis_and_management_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/4528/2214/files/80961800817.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_off00006998.bin
fd413fd72d8b840b57f62436571c26df8e81c1b62a577f3c420529c009aaf421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6998 6356 bytes
font_01_sfnt_off00007dfc.bin
5859e1d9a1de184407742e9738e1b2644dd2e053e9fb28e26e23e88e2fd1f7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFC 12604 bytes

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