Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b7e9c25e9c5cb8…

MALICIOUS

PDF

57.1 KB Created: 2020-11-07 15:45:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 93a94cd3efc1a93eb0e576e60e29af7e SHA-1: 9f8ff2ebed169ea995ca6e0edc4cd9c29fbd82e2 SHA-256: f5b7e9c25e9c5cb8d02629b6fb77081ac9628b339714140e4938b92f32fbcc28
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://traffking.ru/123?keyword=cheats+for+pixel+gun+3d+tablet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376856/normal_5f9f1a634302a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f906bc1350c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_5f98a472d51f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412181/normal_5fa1cc375dcf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f912bf69683f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f8caaf78ea50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5f997f231c213.pdfIn PDF document text
    • https://gutomaxitokivi.weebly.com/uploads/1/3/1/3/131383747/gawovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f86f846107b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8d4ef74e644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f8eb3b2826d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_5f95e3d823a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5f9b055956eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f9b6b6599f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f935802abdb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de140244-1831-43e0-969d-007a650b1eba/language_leader_pre_intermediate_workbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed48326-abc4-4bd6-a8e1-6b9b23758107/bajufemadusegete.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_off00006750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6750 5580 bytes
SHA-256: 1c30b725721cfc3469010da01d3aeb20d4915b91d1870a5c4f3fc00b292211cc
font_01_sfnt_off00007a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A41 10288 bytes
SHA-256: f2894b63c7a0fd0f81aed16521caf1774854492c8551651cd4ccaf01f3520c83
font_02_sfnt_off00009c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C4A 10468 bytes
SHA-256: a8cc2d4518978224ebc36c017e61489f57f1342fdeb046c4f4b52a00d3bbf00b
font_03_sfnt_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 16488 bytes
SHA-256: d4cef62b9ba083631200ba68752a63898dee348253b18e4b718a565dee008801

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