Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca71d168fc40301…

MALICIOUS

PDF

40.1 KB Created: 2020-10-04 22:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3ddaaa1a5c73ead8114c810417aafd31 SHA-1: bded946ffea84bd52d09a9e643bd0c6099c8bd8a SHA-256: eca71d168fc4030152547879a95758b28d8e5fc9a06125ebea02c156e02f3527
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed to distribute malware or phish users. The heuristic firings confirm the presence of malicious redirector links and a link farm. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection, likely to a malicious payload or phishing page.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=improper+fractions+to+mixed+numbers+worksheet+answers In PDF document text
    • https://site-1036728.mozfiles.com/files/1036728/28813608610.pdfIn PDF document text
    • https://site-1038970.mozfiles.com/files/1038970/17799998259.pdfIn PDF document text
    • https://site-1038636.mozfiles.com/files/1038636/40721065255.pdfIn PDF document text
    • http://pifiwe.csulbcki.org/uploads/1/3/1/6/131606630/jovax_xaxifajid_mowufu_jasakitusez.pdfIn PDF document text
    • http://dujafata.guqintables.com/uploads/1/3/0/8/130874565/viguwok_wavisup.pdfIn PDF document text
    • http://ginexemu.aniasadourian.com/uploads/1/3/1/1/131164239/8338913.pdfIn PDF document text
    • https://site-1040048.mozfiles.com/files/1040048/45317389575.pdfIn PDF document text
    • https://site-1037903.mozfiles.com/files/1037903/72981574399.pdfIn PDF document text
    • https://site-1036697.mozfiles.com/files/1036697/18704509748.pdfIn PDF document text
    • https://site-1042602.mozfiles.com/files/1042602/55000651691.pdfIn PDF document text
    • https://site-1037251.mozfiles.com/files/1037251/86899302207.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/dc28b8a8-8089-4114-beaa-2857a7e56bd8/8461970334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8848c38-0e05-4327-bf6e-1896869671ec/walopaxonenogufiguwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfa9071-94af-450d-bb60-679587c9dbc3/pokaxumesefok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3337df9e-055f-4e6c-8a0a-31f54db6a552/86733421360.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_off00005e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E0A 5664 bytes
SHA-256: 8b18e88ce5929c0dd214d112d9c46cac36c9da4eee00bc61df4193517e368869
font_01_sfnt_off00007131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7131 9968 bytes
SHA-256: 4f9795b06c47fe1d5869f89c0cb7f7bc265cbb3bf6f136769ce5dfea2efabff9

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