Malicious PDF — malware analysis report

Static analysis result for SHA-256 41deb5ece5e47896…

MALICIOUS

PDF

55.3 KB Created: 2020-08-02 16:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ff6a772d0cfda778f6349ff6c11faaef SHA-1: 6d20a61356101f78f7adcd1d8a2abada325857d6 SHA-256: 41deb5ece5e47896c446c4278953eb2887c0253a45d5416f7a8d06f56839aef2
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=d%2526+d+age+of+worms In PDF document text
    • http://files.chicostate2037.org/uploads/1/3/1/4/131407364/faximodabu-pegozona-dobadezin-supeminumiw.pdfIn PDF document text
    • http://wamis.mayagongs.com/uploads/1/3/1/3/131381078/b42eb847.pdfIn PDF document text
    • http://files.brilliantbookclubs.com/uploads/1/3/0/7/130776245/a9fd01.pdfIn PDF document text
    • http://files.tarpanmanagers.com/uploads/1/3/0/7/130776735/817adee70b90.pdfIn 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/1/0431/4349/5841/files/58638310711.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7786/0516/files/96420536409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/rs3_firemaking_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0737/6546/files/46278196616.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8674/9604/files/395654762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/fipapikodusagabular.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/outback_steakhouse_sierra_vista.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8584/6945/files/50024511745.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/taxubiwikakupelekegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9903/8631/files/12437485720.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_off00007712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7712 3012 bytes
SHA-256: a5f9277e3a32d85f03268a27eed58614062706f15eb214a454dd21228b9e9846
font_01_sfnt_off000081db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 4156 bytes
SHA-256: bae8c65fbb2985f8f9e3f3f2bcf16a0f9e8e1e4a7d5ebf1135d71e3fbc9ddb2e
font_02_sfnt_off00009009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9009 14932 bytes
SHA-256: 734250532ff0e18544ec956e71c8752844f7a58bb01b7da47532b283290263cb
font_03_sfnt_off0000bab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB0 16196 bytes
SHA-256: dab28fb0f1a0447e482f2af8318bf58d90e6d1b07defb72b83e81a8468afde90

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