Malicious PDF — malware analysis report

Static analysis result for SHA-256 81637ac5624b3f8f…

MALICIOUS

PDF

45.5 KB Created: 2020-10-26 15:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: b98143f068e8230338b5f7c35afd1d70 SHA-1: 545f683d534c4838fbc17688f24607eaa26345ec SHA-256: 81637ac5624b3f8f41daf92d204599c599fe052193bcb3d0e9571cedada924bb
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/pify?keyword=diy+napkin+rings+wedding+reception In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f94fd95ed051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5f8a60f8ef8ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5f932be03a534.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/jiderulovevivo.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/zemosokib-pusutuniro-ravojesakujetu-gomifotat.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/7629182.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/8019832.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/b6c328ce-536c-4761-a874-80736d35c916/64993182149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64319eb6-60ff-4919-a80e-5d5585b5a410/nebezazus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba1999f-61c5-442e-b9cb-1a96c047ddf9/bikusiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f94338d-1c42-4f67-8950-056ea7e2c4b5/vintage_craftsman_drill_press_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/sesijakuwidati.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/speaking_ielts_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/35752303877.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/71500083251.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/21155673847.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/the_elements_of_typographic_style_robert_bringhurst.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/10454772026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff7187c-134a-48e3-b893-5c1f0d1c3e77/kenpo_techniques_yellow_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868ca9cc-937f-433e-a447-ab5889629302/kokikofusajidalesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3143353c-fc94-4286-a8a5-4ae5bbf764c4/96782603945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26832625-e7bb-42c3-a07e-313fdacd2602/vmware_workstation_12_key_crack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ccd063-0cd4-4137-867b-73db65784b7b/jibofewufofiluloda.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_off00007243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 5468 bytes
SHA-256: 53ea096f49d6a68ac086fed8c68b6af463c1e9c9d6a7e7da9562678dd5389ca6
font_01_sfnt_off00008500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8500 10516 bytes
SHA-256: 586374ce300d8a8b7c4f15b8b7d4a935078ceb36b806170aa2f22dc1c373fb7d

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