Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc5a3b23ac06f15…

MALICIOUS

PDF

40.3 KB Created: 2020-10-15 20:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6d2ac63401717a766d122c0e28483cdb SHA-1: e5480f0582f315d74963ffe674773a512dbfd772 SHA-256: 4bc5a3b23ac06f15f7b8d0e36c7079946a064eeaa08d5f21e93b945141546fe4
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?keyword=diskdigger+android+pro+apk In PDF document text
    • https://site-1043702.mozfiles.com/files/1043702/65061024072.pdfIn PDF document text
    • https://site-1043256.mozfiles.com/files/1043256/xomerikemazadofixotux.pdfIn PDF document text
    • https://site-1042630.mozfiles.com/files/1042630/hormonas_tiroideas_valores_normales.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/romasevuraweniwopedam.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/muwawunavuninosepav.pdfIn PDF document text
    • https://site-1041609.mozfiles.com/files/1041609/febil.pdfIn PDF document text
    • https://site-1042844.mozfiles.com/files/1042844/labarazarafebu.pdfIn PDF document text
    • https://site-1039421.mozfiles.com/files/1039421/zaliwibufijapozesodav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f874e8b5fcb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f874a9cc7ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f8770e86912a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f87d06781bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f887f81e639c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f87d89ddaf76.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/1/0486/2210/8837/files/what_enables_a_computer_to_connector.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3582/0185/files/code_geass_nunnally_fanfiction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1939/9079/files/60521367961.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6150/1848/files/kiliwajusiribelosus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0599/6966/files/navodidinageneles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/arcade_k.o.f_97_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0133/8280/files/lexicologia_juridica_muoz_rocha.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_off00005ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED2 5156 bytes
SHA-256: a538e7bb427a6c0eaddbc5ca8fa5d00c5cf4564bdb3132a22e976de9a2a3aedb
font_01_sfnt_off00007071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7071 10444 bytes
SHA-256: a94590b07e26a333e7ef54a118b07393acbb31be5f02e4c310364d686ec65fc0

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