Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bf93f63bc854d5…

MALICIOUS

PDF

43.3 KB Created: 2020-11-02 15:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3b9a6f44fc57f27cb32c1e13aca2edee SHA-1: 6d3c6fd947bf1d7c1922c12cb07c8124888157fb SHA-256: f4bf93f63bc854d5a25467a2c7ee449d93d08cc96fc01760f798e360b4a5df28
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://ttraff.me/123?keyword=mundo+app+kids In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f873079b77f2.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/pekujun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dumupa/lockn_2020_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/zefal_tire_pump_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/bostitch_air_compressor_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/12721324348.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4447/3498/files/manual_of_seamanship_1951.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9778/7035/files/fuwerawedis.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/automotive_diesel_engine_parts_and_functions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5892/7021/files/51393342579.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9462/9788/files/47054905483.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_off00006be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 4892 bytes
SHA-256: 4f1be831af635c1eaf65c36fefd6d50ddd1b451975a432f6c19587aae9b75ffa
font_01_sfnt_off00007ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA8 10628 bytes
SHA-256: d58ea223501a1eb21b7bd7d0a1845e65b070e0eefa182ee7c39ea5472fbd482d