Malicious PDF — malware analysis report

Static analysis result for SHA-256 624ecb1ce6c99799…

MALICIOUS

PDF

46.1 KB Created: 2020-10-25 03:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 6c61b1f049d04d058ddf303ad269d066 SHA-1: 5d3d9caf4d8c7f047466496cf46989ed8dc1c409 SHA-256: 624ecb1ce6c99799673b7438be6f6b29327efbcef4be0535e9fcbc0761790f29
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/123?keyword=manual+handling+regulations+2020+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f9391f12d96d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f9251517dcec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8aaf85cb131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5f93527e356bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f87674e63773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5f90914c6120b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f88c7f872006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f892ac19906f.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000067d7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000067d7.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00009c6d.bin)
    • https://cdn.shopify.com/s/files/1/0481/4084/5219/files/213_area_code_cities.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6460/4844/files/download_game_war_song_apk_data.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9135/4534/files/95536578077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3327/4779/files/dakivisidafo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/gatorade_whey_protein_powder_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/msc_zoology_books.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/armonia_cromatica_edicion_pantone.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/18295038768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/3628/7391/files/kakuvigijawedofowoxezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0558/2244/files/46657212585.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 extracted file (font_00_sfnt_off000067d7.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D7 5504 bytes
SHA-256: f07999308eccea6d1a104208b33ef02fd062f6a606aa3022d298ca18cee6c851
font_01_sfnt_off00007a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 9984 bytes
SHA-256: 7eeb5af3d13b60e7c36de3a5539ef453aa1c80a100230319feb1dc877bffc311
font_02_sfnt_off00009c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C6D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176