Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05b110a8647d769…

MALICIOUS

PDF

42.5 KB Created: 2020-10-08 11:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3334fddfe2f6abb7032374a2e4979afb SHA-1: 7b491bfad07dbd9c35f062e90423928deee00552 SHA-256: b05b110a8647d769d9b391f395f4fd04f7c11cd4a2f54d56cbbf427e362d3af6
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://cctraff.ru/strik?keyword=ryan+ielts+writing+task+1+pdf In PDF document text
    • http://zazil.tigersplayastrology.com/uploads/1/3/1/4/131410818/6137184.pdfIn PDF document text
    • http://files.orient-plus.net/uploads/1/3/0/7/130738564/7341961.pdfIn PDF document text
    • http://files.ruthbrambleceramics.com/uploads/1/3/0/9/130969987/xotubuwelugi-podupovazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6498/6266/files/qualitative_analysis_test_for_propan-2-ol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3118/6589/files/tusojadasipakiduwuzuko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1636/2904/files/55345555784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6164/3930/files/jogemebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5280/0929/files/skills_worksheet_concept_review_answer_key_holt_environmental_science_water.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9184/5016/files/gelowuwukijusog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2847/8102/files/japelabetesadigukeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3775/3493/files/kevupa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5097/1548/files/nukapolixiti.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_off00005f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F37 5528 bytes
SHA-256: 19826cf1121bc0358139f019b4a9a13a2c8368a729618d531c94c3c1e89d0a67
font_01_sfnt_off00007243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 16076 bytes
SHA-256: cde8b6514cd3de4405aec69dc40f4eef4982b155b21f74b1bde59f7018a520c4