Malicious PDF — malware analysis report

Static analysis result for SHA-256 39899ec1a5422b86…

MALICIOUS

PDF

59.4 KB Created: 2020-10-20 15:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-02
MD5: 7625293bb6deb2e5afdb79bacc0255e6 SHA-1: 722b575760544393847e714514cb47e20521daaf SHA-256: 39899ec1a5422b863f2a47e73dbb63fdad0b5f98ca3aa7bf77d3b527196cbb80
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.link/123?keyword=ball+python+morphs+guide In PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/kuzepe-fikatokimabez.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/fefeza_jojosara_bezilajap_baxigomewese.pdfIn PDF document text
    • https://legadiduzavof.weebly.com/uploads/1/3/2/6/132681829/xanubalunagu_pajixile_datekuxe_vamujomerino.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/9460805.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000077c6.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000077c6.bin)
    • http://www.daltonmaag.com/In extracted file (font_03_sfnt_off0000cfca.bin)
    • https://uploads.strikinglycdn.com/files/fdf6ea8c-ad14-446d-94c8-fed77534fd32/15419935926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b49038-1a19-4731-a591-15287af95b2b/durga_suktam_telugu_with_word_to_word_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a961d7fe-6cc5-462e-bd66-56a829474955/45957866182.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6307/4712/files/spectroscopy_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8391/5962/files/airtel_thanks_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dafabf-38f3-4d24-8053-072058438ade/bestias_pegajosas_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82347c90-85fe-4ed3-ae11-6fb8d3857040/24831085676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50744a93-0ab8-4b4b-aa3a-ae8f07a26156/jebufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65129a6-ea64-43d8-b7fb-ac9e1a66356d/sikejafuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/726a6f0f-f8dd-4330-8251-41655dd8d11f/94839687190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb410413-e41a-4256-9768-9cf54c23e545/welujikuwizajej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e0fb77-6af2-497c-9336-3a3821dbf0eb/48293541321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6573/6853/files/solid_converter_full_mega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5328/4008/files/renal_function_test_download.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_off000077c6.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_02_sfnt_off0000ba9c.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_02_sfnt_off0000ba9c.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77C6 5404 bytes
SHA-256: dae9db332d91f9ab67955452bc39998a9cbc8f4b4b75fdbef45664ab7e42425c
font_01_sfnt_off000089f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F5 15592 bytes
SHA-256: 4c6eb107a717291ff00382198f779da86fb09d739a09a01ba5cfd1f074b275fc
font_02_sfnt_off0000ba9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e