Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a9357d0a3c0c12…

MALICIOUS

PDF

49.9 KB Created: 2020-11-08 12:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 6aebf9f5b34517c8532e9e13c4c4eba3 SHA-1: 23c18d7e52a3083ef2fe585587dc61d3ab683d00 SHA-256: 81a9357d0a3c0c120d91634ec45dd481d601ea4a6ea743e1ccbf9b95e4e49eac
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://traffine.ru/123?keyword=happy+color+app+download+for+fire+tablet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372735/normal_5fa4694eeedbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453900/normal_5fa5b1e21ce47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f8f8d8af395c.pdfIn PDF document text
    • https://jugidemavewug.weebly.com/uploads/1/3/4/2/134265355/werumolekuxonar_zulajixipi_jeminig_dexov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_5fa3d3319efa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fa7a84297126.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/059185837809d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fa6b7fbc4f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f90ea22c25ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5f9880cdeb893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5f9971c30eadc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f93a14240194.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/2939213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://nelavikix.files.wordpress.com/2020/11/detective_byomkesh_bakshy_torrent.pdfIn PDF document text
    • https://xeruluzolu.files.wordpress.com/2020/11/gunanegezitujugalevodero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7790 5056 bytes
SHA-256: 7b06d98230266acf9a34cfbb1f87ee3a49ccd3de69e78a3541510f6f0e43c812
font_01_sfnt_off000088d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88D3 10248 bytes
SHA-256: a060648d292604f4922e4db9962d48fa2712c415ae4fc88adb508b7db09bbdc6
font_02_sfnt_off0000abd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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