Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ed71391dbb8a13…

MALICIOUS

PDF

46.0 KB Created: 2020-10-31 09:26:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d15c38d62d55f96fa862ec0e48804e98 SHA-1: ccef240871c6b7b5ae279ab3f6e013897455db65 SHA-256: a3ed71391dbb8a13eb8df739e408b09e3343f7818ac9f63b5760496b32044085
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggraff.ru, which is highly indicative of malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting it is the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/123?keyword=code+vein+presents+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f92c9634d621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f92c654623bc.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://s3.amazonaws.com/pisik/gary_vaynerchuk_net_worth_forbes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4283/0017/files/64536433445.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4484/5206/files/engineering_economy_sta_maria_solution_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0894/8386/files/podumuja.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/nuduzojif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7770/6943/files/kinidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290695cb-c3c8-479c-8831-0d3388142e05/93999498160.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5101/6614/files/vanusezadakipuroxadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f87bc30-da23-4ccc-b03d-5fd401fe5cbc/marilyn_stokstad_art_history_6th_edi.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/92890847703.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/equidad_de_genero_laboral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c6bd9e-a0ce-4782-a835-970d315a6a5e/dubabuzexuluse.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/spanish_bilingual_dictionary.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_off00006955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6955 4848 bytes
SHA-256: 285e0878e5d3e4976881f891b975623c0d8f626c40cb60ae7ad19beb2d67d95d
font_01_sfnt_off000079ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EF 10480 bytes
SHA-256: 75436b8d6487bfe6712fa098985f2579fd68d7e3a2c7b4811064df6a1fc2ab4e
font_02_sfnt_off00009d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D71 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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