Malicious PDF — malware analysis report

Static analysis result for SHA-256 8263a6d4cd89a7f1…

MALICIOUS

PDF

47.3 KB Created: 2020-08-07 22:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 275de53695d3b6f246c1b035dc4fe253 SHA-1: 20860506b6954fb03542fb2cdd7885549ce1a4b3 SHA-256: 8263a6d4cd89a7f1b3e5e3e8a3d5101f37ed3165f70ebb243b253b4920d8bbf4
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.cc/pify?keyword=cirrose+medicamentosa+pdf In PDF document text
    • http://files.milenaszymanek.com/uploads/1/3/0/7/130776327/1708418.pdfIn PDF document text
    • http://files.sarahgreenall.com/uploads/1/3/1/6/131607027/475909.pdfIn PDF document text
    • http://files.bokomarupublications.com/uploads/1/3/0/7/130775834/6d3c391071e.pdfIn PDF document text
    • http://files.homesbyevamarin.net/uploads/1/3/0/7/130740589/zatajabebe.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/1/0440/4504/1814/files/shree_mahalaxmi_calendar_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/prayer_training_osrs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66691602327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9928/3863/files/23087366757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/75177263109.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/70004213244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/astronomy_books_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/pideriv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4016/2460/files/psychology_101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9838/3260/files/rexisorabediminasafulizur.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_off00007ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE9 5172 bytes
SHA-256: 6f80dfd9fb4ba6381e2c4bbd8dd1692da8b40cff982b62168b796f872beddb1c
font_01_sfnt_off00008c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C64 10592 bytes
SHA-256: 311c268af3aec9d98f6a88552501a87c6dd688c3df9c3dd3023ee67233955253

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