Malicious PDF — malware analysis report

Static analysis result for SHA-256 c356b4d9ecdb2aaf…

MALICIOUS

PDF

36.0 KB Created: 2020-10-01 00:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 895b3badf7717f8fab9d7eb6d90e06ff SHA-1: 5d13c1b15a837e12bcdae4d724a7f21d0915a5be SHA-256: c356b4d9ecdb2aaf996e283d51af164513be454cab4e0fe1206f856432fd1329
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 also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely used to lure victims to malicious sites, potentially for phishing or to download further payloads.

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://cctraff.ru/strik?keyword=all+about+me+poster+pdf In PDF document text
    • http://bebeveju.spiderbikemaps.com/uploads/1/3/2/6/132681296/fuzutufigubu-jojizezuti-mapuv.pdfIn PDF document text
    • http://berad.mosston.school.nz/uploads/1/3/1/4/131408170/wulekugiwazanaf.pdfIn PDF document text
    • http://files.faulknerproducerservices.com/uploads/1/3/1/4/131453109/semerodokalogu_rikefes_tugatepusikuwo_xajil.pdfIn PDF document text
    • http://wavug.centraldrivewaysstratford.co.uk/uploads/1/3/0/9/130969260/toxido_baragolakobalu_vateve.pdfIn PDF document text
    • https://site-1036786.mozfiles.com/files/1036786/35216582431.pdfIn PDF document text
    • https://site-1036803.mozfiles.com/files/1036803/sajugibotedobo.pdfIn PDF document text
    • https://site-1036679.mozfiles.com/files/1036679/winudegabusonovi.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://cdn.shopify.com/s/files/1/0461/7830/4154/files/multiplication_division_worksheets_grade_6.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1437/4054/files/23516023653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/kerewanasedizazetek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/72834703422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5193/2056/files/unir_dos_en_uno_online_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4426/5366/files/who_serves_as_the_primary_trainer_for_enlisted_soldiers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/atharva_veda_mantras_for_black_magic_malayalam.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_off00004621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4621 5044 bytes
SHA-256: e8f17a9aa0017b004639bb32a4c6cf57364d50b5744a9104be9fa9fa698b51c0
font_01_sfnt_off00005743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5743 8800 bytes
SHA-256: 95d34b4c416aeb013c2c3003b9e1ca88fc6a4fe9838e4e0d8e6717c071618cb6
font_02_sfnt_off00007546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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