Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bcf4c45af53b40…

MALICIOUS

PDF

36.4 KB Created: 2020-11-03 07:15:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 27fed02ebcb63f1673fb7274a545542e SHA-1: c314c579a0175ab1186cb33160b941a211bffdbb SHA-256: 81bcf4c45af53b405fe6104d0338ef1a31cc03a11efc8551caef1619cab991c4
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.me/123?keyword=the+shack+revisited+pdf+download In PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/bevoguzifarovep-bomeduxetijej-wesageloze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f9bcb0000bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_5f8c23588a6a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f9034ea042b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5fa0b59004b08.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005063.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005063.bin)
    • https://s3.amazonaws.com/wilugugo/free_tree_house_building_plans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f59392c7-9331-4e01-beb3-e694b4d014e2/buxuxopegove.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1274/2564/files/91819944529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/7848/4636/files/wahiawa_middle_school_yearbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0740/0893/files/lista_medicamentos_farmacia_popular.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/jekebuzodajegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c360d431-1baa-49c2-9beb-b2b0d6c94d4d/ingersoll_rand_ss5_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/molar_mass_of_cuno3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57382e8c-010a-4b89-8e3d-64c4b17b2439/87361784950.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 extracted file (font_00_sfnt_off00005063.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5063 5408 bytes
SHA-256: c0318c7efb6f7a26cb0b6b827601c708ae02a60e9e5ad67b3601a8424c592b40
font_01_sfnt_off000062d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D7 9972 bytes
SHA-256: 692b5ed25f3ee71b26b57520f86b9f1587f86ca3d8078e7c2a47932befc24194