Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dbfdff9e712c0e…

MALICIOUS

PDF

34.9 KB Created: 2020-10-03 17:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3063b611a6a65b19e0d4bf50a777b716 SHA-1: 6e1ac83ee2a16ff238ff57385f5a707f399864d6 SHA-256: 41dbfdff9e712c0e9472d4175c1394c9f68a4fc342a23974cbf76763191f247a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Joolz pram sheets' and a URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=joolz+pram+sheets In PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/nefenu.pdfIn PDF document text
    • http://visuse.gohikecolorado.com/uploads/1/3/1/0/131070458/dubazobutiv-mopererab.pdfIn PDF document text
    • http://files.delmarvawireless.net/uploads/1/3/1/0/131070845/c6fd489f44cccc.pdfIn PDF document text
    • http://zegufale.pernaphoto.com/uploads/1/3/1/3/131379116/kemikufip.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/7238de39-b888-4e94-85f5-9b33fdd8b8c5/46704680084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438cd27e-f191-49be-80d9-44ce5273e3ee/41823594764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ca7fa6-f9b9-4a16-bea3-5820a60f250b/8747120379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0688b74a-f6b3-46be-ae5e-79c36d147909/volajudigedebitado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa8b317-3dd5-421e-b0b3-732837b547e9/89713894923.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_off00004acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ACF 5100 bytes
SHA-256: a5d541fc0d69a395614ae2f8adec0ed042e6c14b0bf4b0b0b4a25e89d98c224d
font_01_sfnt_off00005bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFD 10336 bytes
SHA-256: c1b4d388ff916827a4fb8bece496d5bd3ff102cf851b611c76feb277c4cbe3f4