Malicious PDF — malware analysis report

Static analysis result for SHA-256 810b946b6a79784e…

MALICIOUS

PDF

44.1 KB Created: 2020-10-27 03:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 240edd78900220b833de71a88050a0ef SHA-1: 36c2eeee4534d84f0009502c19b5e939041633fe SHA-256: 810b946b6a79784e540fd265f1ed681f88f86291e14fa912861fd0818fb1faea
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to a redirector service known for hosting malicious content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for educational content, likely to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness.

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=why+does+evolution+matter+worksheet+answers In PDF document text
    • https://dekobela.weebly.com/uploads/1/3/4/3/134332871/motesivaga.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/pofaxavute-nimolufojijuji.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/4351543.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/1/0497/9366/3137/files/72465214928.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9149/2536/files/characteristics_of_the_great_gatsby_genre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8220/files/select_worksheet_vba_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5644/2777/files/group_1_model_papers_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3413f811-0315-48bd-a80d-10f3e075ea0a/vazojerakanomogojez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbdc3a44-6936-4f29-8e6f-b80c3397006c/pilopasukulekoxifubeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cadb779-05cc-452b-a44d-5dd8d195dba4/15237187037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a8ecfe-330d-4c49-b75d-3b873dfebe3b/amd_radeon_7570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fac33e7-d155-4141-ade3-703917dfcee1/36569371663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319dc89c-6cdb-4818-8218-045d0edc36f2/koh_lanta_fidji_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8f43e9-9ddc-4ebf-b1ce-12a14dea9748/3708237836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b468d105-caf7-4957-aeb1-150203f404c6/xuremuveruwalav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f15ff4c-bf5f-40bd-a5f7-43aa8e40f778/86174904747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35acde2-923a-4a11-862b-dafdd2039c3e/ekladata_passion_intense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7b911b-37da-4f9d-a7f0-bd2a004b77be/73667071288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0d975d-3e6e-4295-a2a5-688827efcfbc/vumodud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5362c26-d91a-410c-8943-99751762fb0d/the_format_form_is_not_supported_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bc856f-7528-41a5-aa2a-9eef8727e5dc/xavebonidivig.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_off00006e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E33 5396 bytes
SHA-256: 0cfc46b75a73e40a71430f358044b4022ed5ecc8ae00081685bfbc46109d0a4a
font_01_sfnt_off00008076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8076 10044 bytes
SHA-256: 999f7ee7fefc06d54720be16acd2770ab50ec28ac5be9943a20dee7738704cb9