Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8ff3f09d3622eb…

MALICIOUS

PDF

46.9 KB Created: 2020-10-16 21:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 71ff0bb9c8679171248da5cedd7522d9 SHA-1: f58cb4c6882e806b4c0c9adab72e3d423a19c9f6 SHA-256: af8ff3f09d3622ebf4db0df493db66ad18d733ea9c36f03180cef7cb8918dde0
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.me/123?keyword=cpap+resmed+s10+manual', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to external PDFs, suggesting a link farm or redirection tactic. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector points to a phishing or malware distribution attempt.

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://ttraff.me/123?keyword=cpap+resmed+s10+manual In PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/d65a9bcae9.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/zutilipevozafeguwu.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/gekinafataluji.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/7128879.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/8230973.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/datopufufixu_desavinux.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/1000608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb51a60d-6ea1-4ec1-a4e2-dc562e9d2e9c/85017877528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d50110b-5ddb-4bab-ab82-15c5a0a52098/tubonunexit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c691a7b5-8b42-4e15-bf5a-454b356e59f2/rixoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119b2f8c-1a60-4077-84cb-977587664ce3/23968171676.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7757/3054/files/american_trivia_game_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7700/9052/files/community_development_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5700/2664/files/90706004609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0076/8930/files/zerigare.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1554/5247/files/obsequious_make_a_sentence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5043/4211/files/la_banalit_du_mal_hannah_arendt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4647/0310/files/programming_wpf_chris_sells.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0474/9718/files/mufivora.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7248/3228/files/the_dismal_descent_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0867/2423/files/9762141548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0882/7807/files/cost_accounting_exercises_and_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8741/9805/files/high_school_musical_2_songs_work_this_out.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_off00007642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 5204 bytes
SHA-256: 7c4932427a3c3d63d44755996f5d05e93b05174b24fb5746fd2c2d1c295196d4
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 11296 bytes
SHA-256: a0731242c563ab96b701eccdf4818f09960d825554cc6c8383b44f6de3c53398

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