Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3334eb5771fae94…

MALICIOUS

PDF

45.1 KB Created: 2020-10-31 18:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8d17d776889a85f6290c15517b6b9c33 SHA-1: 6287c15c5ed68f471f3feda3a074ac866f193de4 SHA-256: f3334eb5771fae948060b56389a783fb63b679c70ccd77fd29058c4181bcd178
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/wb?keyword=hydro%20power%20plant%20report%20pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which points to 'https://s3.amazonaws.com/henghuili-files/62137435355.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/wb?keyword=hydro%20power%20plant%20report%20pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/62137435355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6458/9988/files/topefotorataxoros.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2735/1717/files/eureka_powerline_4773az_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4493/5094/files/lalax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1016/5416/files/zegixexufunowalusef.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/ankle_fracture_rehab_protocol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0454/5182/files/tafilojifofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3008/8342/files/pusititipibapo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1551/2479/files/rivanerumukutozo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/dovijozelapome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4640/1711/files/jedaginaxikemitim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b36d09-c1c6-4db3-a2a1-e7a9ee74e6b4/24047652649.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/bepogugesivujeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/8579/6765/files/the_executive_branch_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1713/2442/files/terraria_npc_truffle_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb0d3cf-317b-4ad0-9951-026ebd0f0dce/capital_city_classic_cars.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_off00006f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4D 5012 bytes
SHA-256: 5cb978827ae5a650b12acee7c0c12baadf21f33ef23e7eadfa12f7c8cad36fc2
font_01_sfnt_off00008083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8083 11416 bytes
SHA-256: dbddc7296db16067c65dc98953703c4cf0ec3fcd5fa66a7c10efdc8c7aac6c32

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