Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a6be9c86674338…

MALICIOUS

PDF

61.9 KB Created: 2020-10-09 02:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1f95b52bd1176ec00fc54480b3696b9a SHA-1: 3b549016f1339cc977bcbda31d8ee050bf8a6e52 SHA-256: e9a6be9c8667433818810f2b5d8a87a5f80f4b8275269282d31dfbc71877715b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and a link farm. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the list of embedded links, suggesting a coordinated effort to direct users to malicious sites.

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=cocoa+programming+for+mac+os+x+5th+edition+pdf In PDF document text
    • http://files.tikibooparties.com/uploads/1/3/2/3/132303147/c90bad85.pdfIn PDF document text
    • http://files.flaviolombardo.com/uploads/1/3/1/4/131437736/rejuk_turasaramafesel.pdfIn PDF document text
    • http://xufemop.fancyworldusa.com/uploads/1/3/1/1/131164250/183460.pdfIn PDF document text
    • http://files.creaghnsonline.com/uploads/1/3/1/3/131398323/zodoge-wusinizetes.pdfIn PDF document text
    • https://site-1038421.mozfiles.com/files/1038421/21028994538.pdfIn PDF document text
    • https://site-1039695.mozfiles.com/files/1039695/54875276805.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/93669512673.pdfIn PDF document text
    • https://site-1048456.mozfiles.com/files/1048456/pugalubazu.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/39920165850.pdfIn PDF document text
    • https://site-1044473.mozfiles.com/files/1044473/kovazadanezifuruxe.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/1/0438/3077/1869/files/john_deere_model_b_carburetor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/simurewubibujajijubebomep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8649/6415/files/hare_and_hounds_strategy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5214/2244/files/lufotagikizuwopedujipad.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_off00006b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B40 20096 bytes
SHA-256: 69c57758c0affb6b3a1d489da00957b7180cde7241bd44104101e3c65d9d372f
font_01_sfnt_off0000ab12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB12 5632 bytes
SHA-256: a98090b4a384f3e4dabf7b89762cd8d5c93ad5f0ac0ff05622da87a66910c530
font_02_sfnt_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 14092 bytes
SHA-256: 8d1a3f295154e0ab29ac5c5b19f8f8549029d0a2a43c1e9c0712b6307cf8f84e

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