Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5232c3343ee834…

MALICIOUS

PDF

52.0 KB Created: 2020-08-12 07:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b6c6baf60733b2636bacb93bfc492505 SHA-1: 2b505ae6ee90873735e8ffd12c328388b1148fd5 SHA-256: 1e5232c3343ee834b921704698cbb0d8cfe15385712928b1439b65bdfb226ec2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting an attempt to direct users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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://ttraff.ru/pify?keyword=callback+function+in+c+pdf In PDF document text
    • http://files.toucandesignstl.com/uploads/1/3/1/4/131453395/pepurupivez.pdfIn PDF document text
    • http://bowuxiv.comforthomeinspections.net/uploads/1/3/1/4/131405927/58577.pdfIn PDF document text
    • http://files.shopbudasreddoor.com/uploads/1/3/1/4/131453214/980fe4094495.pdfIn PDF document text
    • http://files.upstagenydanceacademy.com/uploads/1/3/1/6/131636923/vipizinom.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/1/0431/1557/7504/files/atualidades_para_concurso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/gosexilidebotarazulineti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/toxetiwiririzosed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1157/9809/files/sirajukagirak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/31319770730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/37264424565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tujekozovazufurujujazer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0319/9136/files/netuvokokiviwul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/97491075454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1382/3909/files/lelilupelexutepopoxinodaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/jokexidatebodobifun.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_off00006bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBB 4984 bytes
SHA-256: 053a4df47abc8110ba962b945d157a5ef496924d98db4bfd909f438988ffcfcf
font_01_sfnt_off00007cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBD 15440 bytes
SHA-256: ace30d55bc4adcda61b690b63df5d0cb3fbe1f6eb8a9a2907789a4b73c8316ff
font_02_sfnt_off0000ad6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6E 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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