Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42c3b6cbafa9fe0…

MALICIOUS

PDF

61.0 KB Created: 2020-11-02 22:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: d7de07b881919e274bed3c8b57dfe36b SHA-1: 76811ae43b1972f5b31a563351b1334f33c408a9 SHA-256: a42c3b6cbafa9fe00fdf8904d59d91f46968a226bc8fb219fc71405d35b523de
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=shoqbox+sb7200%252F37+manual In PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/469164fb2021c10.pdfIn PDF document text
    • https://luminesip.weebly.com/uploads/1/3/4/1/134108660/31589cd.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/jufifu.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/1/0483/8352/5021/files/battle_of_the_books_2019-20_list_wisconsin.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/diwali_festival_essay_in_hindi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6501/5965/files/6955538431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4440/2842/files/auditoria_de_gestion_de_calidad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7415/8244/files/subaru_legacy_gt_manual_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8378/2062/files/14388854874.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000acb1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xACB1 24456 bytes
SHA-256: b629b9a253f8f2b360ef3d525b3aa81ce7a5cfa9e1fd4485828e35a8dc468c54
font_00_sfnt_off00006d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2D 5456 bytes
SHA-256: 87b1d160d5e8fb591adfbdc621c39d7bf98aedc7704a091e34e494751af48097
font_01_sfnt_off00007f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9B 14472 bytes
SHA-256: a6d5ca11d25a6c7b1fbbe0d91e13b54749bba12eb13cfd28d478e58f30f3da2a
font_03_sfnt_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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