Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8038470a2f2192…

MALICIOUS

PDF

36.0 KB Created: 2020-11-01 00:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: bf763e906d35c0a470748380ef6c17cd SHA-1: d50b1b67bce0d25e3ad7d930b4f57127117ef720 SHA-256: 4a8038470a2f2192732e98e9046a54462d3dad6f50da4a2939aeaab1e00bb3c3
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/strik?keyword=minecraft+guide+to+redstone+circuits+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f96b89166462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f871a76ed6e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5f98ccf4ca31a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5f92f200ed78e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f8a6aa7363a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_5f9752dc1686f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5f8ca42167de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5f97a774c3c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5f9b6f9d2adbc.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/e30a25.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000423b.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000423b.bin)
    • http://www.daltonmaag.com/In extracted file (font_02_sfnt_off00007551.bin)
    • https://cdn.shopify.com/s/files/1/0503/3544/9238/files/jezemefalujikikusatuzok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8568/4124/files/kapefagetavaxizetup.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_off0000423b.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000423b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x423B 5248 bytes
SHA-256: 65a466e37b514987e4706d6f6a8d12be52773a4ef70366d9ab108e6a5c0f97b9
font_01_sfnt_off0000541b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x541B 9712 bytes
SHA-256: eca068b17e09658b09cf4cf0d2cfd6e8c9e43493f63b7e7c1b5d67a714cf74b5
font_02_sfnt_off00007551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7551 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333