Malicious PDF — malware analysis report

Static analysis result for SHA-256 27acf500ef20e505…

MALICIOUS

PDF

38.5 KB Created: 2020-10-01 10:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1084c4134371fdd40d767c9bfa36e500 SHA-1: e3aef2d7dbdb87b7a6562d787e9e19fd7b7235a4 SHA-256: 27acf500ef20e5057253462d0e8e5116c851c2941c83d19f8c82371fd8100205
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=antrenmanlarla+geometri+1+pdf+%25C3%25A7%25C3%25B6z%25C3%25BCmleri In PDF document text
    • http://files.stpaulsellicottville.com/uploads/1/3/0/8/130813768/vanitawubilero-wiwavibobewabim-wejonavin-rixedinedor.pdfIn PDF document text
    • http://zabamobep.spicecommunity.org/uploads/1/3/1/3/131383330/zozolunujusesusute.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/1/0428/9835/8432/files/reragijod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4946/8582/files/erotic_spanking_stories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5678/9664/files/gifodijova.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9860/6230/files/pokeland_legends_cheats.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2690/5245/files/5119418917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5232/5272/files/short_prayer_to_st._philomena.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7579/5099/files/best_jedi_sage_build.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/699263861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3555/0118/files/15394079412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6245c29f-1af7-408f-b159-00e08c9dc444/638385316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd18f68-0505-4025-a0a4-b0073e75f8e6/zomupokeforunuvigozixoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d911a59-d206-4a32-af1e-6f81d7731179/40210725476.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_off000054ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54ED 5712 bytes
SHA-256: 922b5599581f9406491577292c25e7d9e852b5500ff45f527c1515eb2d742202
font_01_sfnt_off000067d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D8 11352 bytes
SHA-256: 963d0b2e83a5c0ffbe8c3dc7da4c872b538810723cc261d974ef9281b76ba23a

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