Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe4efa3d40aabb4…

MALICIOUS

PDF

40.9 KB Created: 2020-10-04 09:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ebb662aaa9a7c4d131b4b4835ba6acd0 SHA-1: 2ae5a1a7d5aad8249008b6d9f9d73fad398770a9 SHA-256: 4fe4efa3d40aabb4cb0ee0588f48f6a6a2ff9b100e5af9a59257461718b4d0d0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to disposable domains and a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely intended to lead the user to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the conclusion that this is a link-based lure.

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 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=figurative+language+reference+sheet In PDF document text
    • http://files.zachstangebye.com/uploads/1/3/1/3/131380163/luzegelanogofi.pdfIn PDF document text
    • http://files.ocdandanxietycounseling.com/uploads/1/3/1/6/131637896/luwixozisuxod_daroxaduguw.pdfIn PDF document text
    • http://jopodew.dulcineaquartet.com/uploads/1/3/1/4/131408071/31561b339bcad.pdfIn PDF document text
    • https://site-1038948.mozfiles.com/files/1038948/72777610731.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/40940216320.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/65396828995.pdfIn PDF document text
    • https://site-1039308.mozfiles.com/files/1039308/ruwikisunajemulo.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/ruxeluxoluwejivaxigiso.pdfIn PDF document text
    • http://files.metaburger.com/uploads/1/3/0/7/130775150/4812035.pdfIn PDF document text
    • http://files.booksbyljwilliams.com/uploads/1/3/1/4/131406202/defapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/35ab77e1-e020-413e-b185-df22e2d055ce/92162477393.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5192 4928 bytes
SHA-256: 1e7e0ccee851fcb81ce77836695cd9fd8f991f9e7cac9cdd00a1b84d4b17753e
font_01_sfnt_off00006257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6257 11512 bytes
SHA-256: 79e7411219c83e0263a9bc5ced94431afe338fee643befb4bcef1a12e882443c
font_02_sfnt_off00008854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8854 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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