Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce5f280816d0b6d…

MALICIOUS

PDF

49.1 KB Created: 2020-10-09 05:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: a12b18270a8cdc1e507059f972450ca6 SHA-1: b1a2c6450fad55b13d8baed4560f17c523719b3f SHA-256: 4ce5f280816d0b6d6844c47d29c9416a5ebb853f7565f9685a16df334dff616e
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://cctraff.ru/strik?keyword=capillary+rise+method+surface+tension+pdf In PDF document text
    • http://pusifod.mindspringhempco.com/uploads/1/3/1/0/131071145/mimefadoma-nezapi.pdfIn PDF document text
    • http://files.steveoauto.com/uploads/1/3/0/9/130969080/kixesilasufilos_netawoxexe_galofojiga.pdfIn PDF document text
    • http://files.thefathershouse-stmichaels.com/uploads/1/3/1/4/131453867/914ac5eef.pdfIn PDF document text
    • http://files.scottishceremonies.com/uploads/1/3/1/3/131382808/goxik.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/1/0483/2677/0852/files/currency_in_panama_and_uruguay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7605/9290/files/oedipus_rex_unit_test_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4599/3634/files/keystone_aea_login.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/9667/7026/files/southern_motion_reviews_and_complaints.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6755/3430/files/final_fantasy_11_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1855/4010/files/nereku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1399/6183/files/86453918857.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0721/3219/files/86240103192.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8E 5404 bytes
SHA-256: 003ac4468d252e66173a3da86ddfcd0fff8a4751dd04cfbe8603521dcfa54481
font_01_sfnt_off00007ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCB 10704 bytes
SHA-256: a54fbbcfc2e42b27216d06bcb7a8297e0b527badb1f17cd4c43e870df8cceb78
font_02_sfnt_off0000a1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1AC 16256 bytes
SHA-256: be737188e71b15e12ebacb035f724348c7f521c5bf61da9470542e2bf65ecdf4

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