Malicious PDF — malware analysis report

Static analysis result for SHA-256 a777d953c2796a9a…

MALICIOUS

PDF

42.5 KB Created: 2020-11-01 03:50:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9e1d890a5d6c9c6159577ce6a9b0c5d SHA-1: 3d956c6534956a47315cf3629c6618e3924c3ca1 SHA-256: a777d953c2796a9a2dfe7a49384ba0a2bcec3fd03f094d96256dc28bb8c56c83
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, one of which, 'https://cctraff.ru/123?keyword=samsung+sm-j337az+frp+bypass', is flagged as a known malicious redirector. The document also features a link farm with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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/123?keyword=samsung+sm-j337az+frp+bypass In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f926e7842d6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f870fd5df06e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f91855c9d268.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/avesta_trke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1488/0932/files/madden_mobile_hacks_no_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/wetunadijuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7374/7140/files/fasozexigibitu.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/national_lampoon_vacation_quotes_wally_world.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/zaturatekenabuwivu.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/risoxurivezepazujato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1620/2651/files/euro_truck_simulator_2_gameplay_android.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/electric_state_darkrp_map.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/boxonapikav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000638a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638A 5936 bytes
SHA-256: 440ce412498002e8aedf1f6316d2e45256256632a3be41f10df096749c5d5f45
font_01_sfnt_off000077d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D4 11044 bytes
SHA-256: e7574918c8d45de885d2f08f33dfd013769fc481a0b60a74ddfcdf15b5060192

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