Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a00290e593cc7f…

MALICIOUS

PDF

52.1 KB Created: 2020-10-06 22:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9f06f55c016238c7243168ab1f4cf05 SHA-1: f1dda91b3056da74c395f1425e93d5adecc95abf SHA-256: c4a00290e593cc7f4b2f324c2989afd92d221997dd23db25649fd8c4ae41f886
124 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ggtraff.ru/pify?keyword=zenonia+4+druid+bear+build', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to direct users to malicious infrastructure. 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 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://ggtraff.ru/pify?keyword=zenonia+4+druid+bear+build In PDF document text
    • https://site-1039207.mozfiles.com/files/1039207/zegupenewosejoriviwogol.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/30095593539.pdfIn PDF document text
    • https://site-1039343.mozfiles.com/files/1039343/28333243178.pdfIn PDF document text
    • https://site-1039549.mozfiles.com/files/1039549/5642238106.pdfIn PDF document text
    • http://files.westfieldvictory.com/uploads/1/3/1/4/131437160/masojenabi.pdfIn PDF document text
    • http://wodepitu.angelatipsey.com/uploads/1/3/1/3/131380598/zalutetivajefa.pdfIn PDF document text
    • http://putasod.businessrescuene.com/uploads/1/3/0/8/130873853/nikozosutanarofojabe.pdfIn PDF document text
    • http://nedud.maoptometry.org/uploads/1/3/2/8/132814930/9348538.pdfIn PDF document text
    • http://gajono.enneagraminteams.com/uploads/1/3/1/4/131483281/gevigedunajox.pdfIn PDF document text
    • https://site-1039698.mozfiles.com/files/1039698/53028647321.pdfIn PDF document text
    • https://site-1038522.mozfiles.com/files/1038522/44341387658.pdfIn PDF document text
    • https://site-1038770.mozfiles.com/files/1038770/mefube.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/tilobadisivumakekozomaxo.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/5788a347-9945-4d04-8def-1496ff836d9f/nubabewisexag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210dc527-d979-45d0-9f06-a83168fe2334/4215903311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/059a3450-2ab8-46c2-b117-1af854474d9d/50846757401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e48c36e5-6053-43fe-8c6a-1f9532ed82e7/13940850579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4ecfb0-0b77-4ec0-9cc1-3c4838679120/23255410850.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80BD 4628 bytes
SHA-256: f0a9c398a1045da604bf7498616fdd48449771712dc13ecd8b6ddc2a3843074e
font_01_sfnt_off0000906f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x906F 10704 bytes
SHA-256: ed38765bd1472eb950c6df080913d26cb42d0635fce53e254567ac2f0c01fb40
font_02_sfnt_off0000b4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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