Malicious PDF — malware analysis report

Static analysis result for SHA-256 4188a0eff9b20559…

MALICIOUS

PDF

49.6 KB Created: 2020-10-27 14:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 0c87368efaf9f1444a8871167faa0f20 SHA-1: 481616b0a3439c82223c9741617fb3898f5609c9 SHA-256: 4188a0eff9b20559f484f711b17b19d731e872087a8fae56c56e7f2cc6e23ecd
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/pify?keyword=greek+to+english+translation+and+meaning In PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/6613868.pdfIn PDF document text
    • https://fobewesepujub.weebly.com/uploads/1/3/2/3/132303403/xisub.pdfIn PDF document text
    • https://gesofomudejow.weebly.com/uploads/1/3/4/3/134344239/wiridigivevub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f92c3485cb26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f96b879ac18f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f87ff15e7e0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00008331.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00008331.bin)
    • https://s3.amazonaws.com/gifiz/break_even_point_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/atmel_studio_7_c.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/jilanapikulifugiluku.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/fetalosaderoguradujeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d106b6d-aab1-41f3-9886-004e996b9159/watch_sling_blade_online_free_megavideo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0181cd46-7139-488e-bdae-b1cc529c7bd5/gekatefezojoserived.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/14037222017.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/gazafatax.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/nulidavapolugezi.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/anatomy_of_long_bones.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/vijumoputodorasobekuna.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_off00008331.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 5332 bytes
SHA-256: 3160fb8510349882552cd0d25f857ffa4b755efdc40621b442992ec5882ee864
font_01_sfnt_off0000952c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x952C 10492 bytes
SHA-256: 9f8c50382c7d10d0ee1728b37d221d2b2f400f4aae12025eda3394acc8cacdb1