Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d9d154c0fd26be…

MALICIOUS

PDF

53.8 KB Created: 2020-10-27 14:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 459fa04ebe2d0b7a10446de3c49cefde SHA-1: 184d295a15abb32e21973905cc5074f1e712515f SHA-256: 78d9d154c0fd26be6d14056468094706f367defac7b5f9b7a64a1588cf81216d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier strongly indicated maliciousness. The document body itself contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent of directing users to external, potentially harmful, websites.

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://ggtraff.ru/strik?keyword=molten+core+loot+for+shadow+priest In PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/5998729.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/kofimidipi.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/pegoroladula_lalusad_saziwenikavevim.pdfIn PDF document text
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/f3c273a24b4e6.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/6894496.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/cc460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5f9205121da5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f8f13bb2e80a.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/8497750.pdfIn PDF document text
    • https://zumavekuganupa.weebly.com/uploads/1/3/4/3/134366180/d1bbeaf91b2.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/264294.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/giguxilil.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/lipomi_nalat_najukapudenig_nudew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1275/7400/files/oracion_del_justo_juez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4295/8231/files/fojulotele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/7789023970.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6952/9509/files/the_norton_anthology_of_american_literature_shorter_8th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9068/3065/files/37137576647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9689/4357/files/22752688146.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_off00007c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1F 7128 bytes
SHA-256: 16386d3c97b91b0edbe2d9c6a6701619081fb84bc90c0ba27021978c4058b7ed
font_01_sfnt_off00009357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9357 5340 bytes
SHA-256: 9d108fbc0575c96299810988aa9d77212e334d3c64590b4abccd5d34ff57c5c9
font_02_sfnt_off0000a596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA596 10484 bytes
SHA-256: 04787d6fe3b7f2db607af271dfb18f74f8b263d0f332cb1e94e361a717959957

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