Malicious PDF — malware analysis report

Static analysis result for SHA-256 823698a19578864e…

MALICIOUS

PDF

48.2 KB Created: 2020-09-26 09:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b35a8b0d0607ed51503d1333594c176d SHA-1: b819c020b1277ac66b74ad2171d2af2de0bd4599 SHA-256: 823698a19578864efede45dcad39be5a81ab2358073922c9034d38eb248fe7c7
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=edmond+dantes+fate+wiki In 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/1/0431/9766/1348/files/ropolevovexikinu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/30418753722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/gafirar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34996744553.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/pajapaluf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/street_fighters_unblocked_jericho.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/dikupikaxoran.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5659/8692/files/wikazibokutawixukodunixil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81108552740.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1932/7896/files/ro_ghoul_stats_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/tro_chemistry_a_molecular_approach_3e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3638/0831/files/75017423562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/81670734887.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/spanish_to_english_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/91411722525.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9902/9655/files/betew.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_off00007f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F87 5036 bytes
SHA-256: 5cfbf43723fc5c2be7af2e18a0f86360b40fa67641cf4b28c8fd3ff24fce6b69
font_01_sfnt_off000090b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B6 10452 bytes
SHA-256: eaf1fe2fdb9af502f61ec424c2988e6c8b46d4beaf85867308e3f5f17a3ba5ef

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