Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4b955159ccc026…

MALICIOUS

PDF

53.2 KB Created: 2020-10-31 13:24:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 257ca41542dacba4d071fe52131e4e5c SHA-1: 85618411a78e78d9503feeec18ae991e05dba784 SHA-256: 8e4b955159ccc0264075bf7b52a39c6b046296876c18506d707944da05bd7104
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.me/123?keyword=mills+vs+board+of+education+case+brief In PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/b35e7c2de56a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417534/normal_5f9d3d0800a89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5f90cc30c7be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402940/normal_5f9d17b17be8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_5f98ecfb76885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_5f9041cad4a73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5f98284159959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f8ff64a1dd10.pdfIn PDF document text
    • https://jijibaduwa.weebly.com/uploads/1/3/4/4/134495912/9407089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f876f25b2113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_5f9bf4f15974a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5f8eda7e13806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2470/1845/files/the_landlady_roald_dahl_theme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2683/1267/files/rush_wars_new_update_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000844e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844E 5104 bytes
SHA-256: 80ede97ca7fba46aeeb604bf73851708aad04f185040f2f7fe436959793cff1b
font_01_sfnt_off000095b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B8 10468 bytes
SHA-256: 8c569de0ec7a3d40d3ced2a5524c4e1f15c4863fa7111d2b177ca645a8280130
font_02_sfnt_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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