Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b04150b3cd1c53…

MALICIOUS

PDF

44.4 KB Created: 2020-10-16 02:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 71c81c79f2cf84fe93fd5597e3611a32 SHA-1: 9e2775a2164fc2ca448a851cddba2a8d84fc2662 SHA-256: d3b04150b3cd1c537a56755e485c14fdc9584a0e26f248d907158ca61fdc04ee
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://ggtraff.ru/123?keyword=irs+publication+535+pdf+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f87595d0894b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5f88c20323667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f8815ece4a36.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d653c16-6a78-40e3-8ca5-b61d7e2a7d42/4948009798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/293a7965-7ed4-4515-9b1a-161d03b5e722/4175139421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c5fa955-5183-4055-bed5-62d413a0360d/44915043668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7980d37-7761-46a1-bd2e-400a40152307/dukilejaniforoxajit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e656fd85-23ab-40cc-8d88-836d66486879/18484990806.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/9318/0575/files/increase_reading_rate_army.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8893/1735/files/85551281770.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8534/1876/files/38856476601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/19431410020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/roblox_gui_script_copy_and_paste.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0901/4432/files/i_am_poem_examples_for_college.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2018/0376/files/nexizefukukaponegamefatiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8182/1088/files/xukojenuxitaladunasojodug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e38e9a-becc-4ad3-a950-5b838850f3a2/kalifetafejededik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2c1556-edc4-4346-9a8b-d2b6cdb19aae/20188354729.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_off00006eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB3 5788 bytes
SHA-256: 1834fdbbdb655a3e9ae56be5bea4c96ac9ec71cf8debc0f19cc48291ff891028
font_01_sfnt_off00008264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8264 9864 bytes
SHA-256: b0f305ba24568cbdf4ff9916c73523354c5f0894508c7581bdfb8439ac300634

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