Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b8f87bfe84bb6c…

MALICIOUS

PDF

43.4 KB Created: 2020-09-13 05:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: fde9e6710a10e882d6b98e1970b05ead SHA-1: 08006f51bedec4dba41c0c5ecdc846d500cee556 SHA-256: 16b8f87bfe84bb6c63e088821fc67ba5734cfd2f3d03f15f7e10b0b7162442d9
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.club/pify?keyword=bruce+springsteen+tour+2020+uk In PDF document text
    • http://puwonokam.topiaflow.com/uploads/1/3/0/7/130776485/tagusimebogebofafa.pdfIn PDF document text
    • http://duwodak.a-mel.co.uk/uploads/1/3/0/9/130969627/e8516e5e101e.pdfIn PDF document text
    • http://files.luftgear.com/uploads/1/3/0/7/130776277/fudomi-kagobob-noposofage.pdfIn PDF document text
    • http://xofefobi.westbrookartistssite.com/uploads/1/3/1/6/131636698/1111570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/2c8d66_ce5bcb2b519f45d3b4355c8f3a4c2f4e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_aa1d48ee2241479585c769cc68060bd9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4c3d6a_2ef4e7a372be4f038dc9d877dd8df4c5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/73_dodge_challenger.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/86666323587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1027/7025/files/harry_potter_1_streaming_vo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1823/0688/files/74606793573.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/20d83a_f50bd15b115c4e82a74f3a95581595d3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/529ba0_1f3d345b4f9e4acfb755d8af26ba67e5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_53aab9d6d5c14b72a94ac2b9ac3f740e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/16a96a_8d355bf7c0b045eab8168cfb30bace51.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/defcb2_7568a4153ac643f8895a579bd0e5a8e9.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_off00006aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAD 5248 bytes
SHA-256: 998e2de04ae05525ba9ea823e6386a2d1b09fac99e8254111e53ca0fa3ea9143
font_01_sfnt_off00007ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA9 10560 bytes
SHA-256: f18ca9bbddb80d7e1b77e6400678f4c4c928605b689a0bec2e9c0236bcb95388

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