Malicious PDF — malware analysis report

Static analysis result for SHA-256 2727c787b8d9d1a2…

MALICIOUS

PDF

45.7 KB Created: 2020-10-30 09:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 18ff4c08f7dd33153a533a89e83cd479 SHA-1: f89414efc124573d44ad0a57d14b0ba383afe78f SHA-256: 2727c787b8d9d1a25c2e68e312512f5859aa16e272d1b71a6f3456ca387f4197
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical redirector link disguised as an authorization letter, aiming to lure users to malicious infrastructure. The ML classifier strongly indicates malicious intent. The embedded URLs suggest a phishing or scam attempt, likely to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.link/123?keyword=authorization+letter+to+pick+up+passport+canada In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/xereromejiv-koxozirusoror-moxonujis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_5f9390ece24ed.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/151d06f9-be2c-430c-aabd-cf5c3aa936e8/18260235813.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4980/9562/files/gutugajeniki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7337/8721/files/hill_climb_racing_2_unlimited_coins_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4429af9e-f8d5-46c0-800f-a89609e49d89/bidiradawovamisewami.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6324/6485/files/papadomiwegawosij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5827/3183/files/bowmaster_bow_press_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6594/9341/files/survey_research_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1edc147d-d8ea-47a3-a32f-21dceb2b1f53/zanawakobajofizi.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_off000074cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CD 5264 bytes
SHA-256: a019da82c5440338d81be9ca7d5a68983242bff667f9fe479e0e5677f0a2f6ef
font_01_sfnt_off000086af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 10420 bytes
SHA-256: 06a8d85da53693956f8a4c97c30f8a2366a222b6359f48f9816f045b223c65a7

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