Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c9fb1138fae9aa…

MALICIOUS

PDF

60.2 KB Created: 2020-10-19 00:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7437e9cf49125c9214eac94a17dcaf5d SHA-1: ac8541a533641d9d552c790400a590b4353fc116 SHA-256: 85c9fb1138fae9aaec97ea892f00ea966addc1ab6c5c7c51ffdd7bd71b16bc59
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.me/123?keyword=ios+notify+bar+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f8bf18889cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5f895d04a7a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f870a436aa34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8747dd3d4b1.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/rezazem.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/4867245.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/lezalupaju.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/guwevesa-kizixitunuwov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8949223e2bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380528/normal_5f8b34185b51c.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://cdn.shopify.com/s/files/1/0488/4080/2469/files/51349721328.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3406/2231/files/biddeford_heated_mattress_pad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7381/4172/files/20889848900.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/abas_3_scoring_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/fafegerobuzolepif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1836/3295/files/sigavagobeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13783d81-5f99-4b79-971e-cfb818370fc7/56261399296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadeb373-ddd9-4c36-bb06-9587fc8fc1e5/7900639780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b23e1fd5-d2e4-45ab-98b0-de29734258c6/49358553643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a9b054-73e4-4478-aeb8-00da384f68c4/43556625806.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000b959.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB959 17900 bytes
SHA-256: 04bb7d5e77764d570538aebc53ce1e91a453fd97634785b1aa04db7b4d23dd4f
font_00_sfnt_off000079d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79D8 4776 bytes
SHA-256: d359dcb4ae1096d7b78138608ca5a523dbc93d0fb337f51c4c14b4d59c7a99d2
font_01_sfnt_off00008a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A05 2252 bytes
SHA-256: f3ffe4ba3621d765656d78aaabd71fd798feab98c1821a744cf45e925a576ee8
font_02_sfnt_off00009446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9446 10940 bytes
SHA-256: 158895a92e300e5705cf07a5dbd22f830a6fc3a897438617aca9467b5878802f
font_04_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34