Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b28b153fb9b7806…

MALICIOUS

PDF

35.9 KB Created: 2020-10-09 14:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: dae951f1af922ec9ce2e6d27e278f6fa SHA-1: 821255bf078b2b7e8e0db141659623924be84c52 SHA-256: 6b28b153fb9b7806809494d027e45f40774dd938e48950e1b3b07c5388c1fc86
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://ggtraff.ru/strik?keyword=listerene+whitening+strips In PDF document text
    • http://files.bencaunt.co.uk/uploads/1/3/0/8/130874085/7120498.pdfIn PDF document text
    • http://files.readingworksmedia.com/uploads/1/3/1/3/131381204/b1da0b.pdfIn PDF document text
    • http://files.embracechangehypnosis.com/uploads/1/3/0/7/130775337/xowudifazivabuzesaje.pdfIn PDF document text
    • http://files.bonddogtraining.com/uploads/1/3/1/3/131380236/rivofagudeze-jadapekivotukot.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/1/0431/2501/4684/files/91603745906.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1805/0472/files/chemung_county_sheriffs_office_phone_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3856/3230/files/florida_studies_weekly_grade_4_answer_key_week_6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2386/8319/files/man_of_steel_piano_easy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6329/5646/files/37164461628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/60827125436.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8581/0852/files/harry_potter_wall_decals_diagon_alley.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/rapupotedofovu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6876/5848/files/bose_wave_manual_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6628/1121/files/jofoxori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/bowuwogukefipig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7503/3505/files/xubanugipojete.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_off00004ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFE 4872 bytes
SHA-256: 081fd22c97eb26c03a6ac130037547e0e4f33ba703816fedbe71ee7c4e6ad11b
font_01_sfnt_off000060aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 9960 bytes
SHA-256: b152afd9b6421e2050a02f60456b51a8c3fd564cca8cefd8b03255d16aeaa5dc

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