Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc5d081bdfbe8cf…

MALICIOUS

PDF

46.8 KB Created: 2020-11-06 09:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 649a97883828370d3bf20028f906aca2 SHA-1: c79a48b7ac850c5a67d6cd04b9ee8d54b2cd909d SHA-256: bbc5d081bdfbe8cfeaa8367c64512aab5cbb41c95a31eba2b7a503adf3e6ce0f
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=clicker+heroes+redemption+codes+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f9ca4397af63.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/834649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_5f9fe6069ea9a.pdfIn PDF document text
    • https://sopodepewujo.weebly.com/uploads/1/3/4/3/134340903/470941.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://uploads.strikinglycdn.com/files/0bc16c49-e698-42e9-8121-eda0872f84c8/rct_101_i.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6ae8da-1748-4dc7-9db3-9ae38e81bfc7/candy_from_of_mice_and_men_description.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/ground_elk_recipes_paleo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00092df4-1dc4-4008-8a12-df43da8989c3/the_prayer_english_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f576fa3-e205-448d-bbd8-f3ec7eb325d5/49576225224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c56e713-b85c-47b4-967b-3b3958a89883/44695196421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd7e6656-ed7c-4320-a4ac-5b15170b6fec/kokodore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ea9e0f-0562-47bf-b0ed-9edd7de09f3f/3826940829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3a19a7-b205-44b9-98fd-9820baa1bdbc/decibels_in_science_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8626aec-ab1d-4a29-949f-973dcee735f6/acknowledged_in_spanish_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc705268-31d6-4955-bde8-c31d98702849/45988464658.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_off000069ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69EC 5460 bytes
SHA-256: 86fb942a7d1748c733eff1bc3982ff49fd0a0892efb520e362a1ca0885b45f9d
font_01_sfnt_off00007c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C4B 10468 bytes
SHA-256: 44b4044760cf638b644bfe8d661b288defbd42123d0db9fefc2f3783934f2282
font_02_sfnt_off0000a011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA011 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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