Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9f537886af857a…

MALICIOUS

PDF

46.1 KB Created: 2020-10-30 07:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2b4088400cb2d8331daf325595cb74e0 SHA-1: 3cd755b9299ed22a5a291006192c11389e4fe708 SHA-256: 4c9f537886af857af76c6ddf4bf72d5e1cb77c1dfe4663b6e4f20c0aa7c49cbe
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to redirector infrastructure. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful sites. The ML classifier also strongly flagged this PDF as malicious.

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=directed+reading+and+thinking+activity+%2528drta%2529 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8f4b3764eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372963/normal_5f8c89f6dcef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f9489802e53c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409122/normal_5f983cb94fc71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f870157b2714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f897cdf6273b.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/3670974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5f8a0add1ef4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_5f97a75b280ca.pdfIn PDF document text
    • https://favurujovonelod.weebly.com/uploads/1/3/4/4/134435517/ccac052ddd4.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://uploads.strikinglycdn.com/files/b4621f55-0030-4b32-9929-e6516d9ca6f0/pepukupakajovawuweza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8326/6746/files/41163312151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7561/5902/files/dictamen_fiscal_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5815/0599/files/kinemaster_prime_mod_apk_2020.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_off0000684a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 5048 bytes
SHA-256: 3a2aef5880393babcf638c8559209926fb6a8f19593c049e87ff284d553ee445
font_01_sfnt_off0000797f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 10476 bytes
SHA-256: e07c01285471851d3b13bebc01b2baf2663a644f777145a0d8a8135cc91b6247
font_02_sfnt_off00009d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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