Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d318a70a9acf4ce…

MALICIOUS

PDF

49.4 KB Created: 2020-10-13 16:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2399373da2fd30474df275523287a663 SHA-1: 3d5f05f82848288dd731f8743b806bc3ec673856 SHA-256: 3d318a70a9acf4ce5e2de18ac9925035f98c616eaa3e4d609c55df4a829eb8bc
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are part of a link farm hosted on disposable domains. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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/strik?keyword=count+on+me+piano+chords+pdf In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/09b03b.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/vovofofaverun_sawivurovoj_nifawubazox.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://site-1039270.mozfiles.com/files/1039270/fibes.pdfIn PDF document text
    • https://site-1038946.mozfiles.com/files/1038946/godavo.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/rirubejuwovelesoli.pdfIn PDF document text
    • https://site-1040097.mozfiles.com/files/1040097/97170183831.pdfIn PDF document text
    • https://site-1042971.mozfiles.com/files/1042971/nikofowagivalusuxesogelaj.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/mixigekove.pdfIn PDF document text
    • https://site-1036695.mozfiles.com/files/1036695/mokuzipedus.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/suwubalifufaf.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/tivunajer.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/121ad652-4682-4ada-aa7a-9221a0f7fddd/33041807073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67889e88-b1cb-442a-b1d0-239e4720eb25/9050773778.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 5268 bytes
SHA-256: 805f94cf5e23d96b067bc109a85fd5412049239b564384c96c0b2a249612a2d7
font_01_sfnt_off00007574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7574 14580 bytes
SHA-256: f14e2301bac86e1e7a61a452cfa4c08cf1038358cc9a46086522ed74bd156f51
font_02_sfnt_off0000a3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BC 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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