Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f60b9e9620f72d…

MALICIOUS

PDF

49.9 KB Created: 2020-10-20 02:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2b50a51e3eecffc28c5b4d14d63d185a SHA-1: 275dc32b4d8c57395b4d4a871fc9f6380c1d91fc SHA-256: b1f60b9e9620f72dbb522006712191b0725e39fbae39ce7d52207fd06caef226
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains a URL that matches the redirector found in the heuristics. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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/123?keyword=sportsman%2527s+guide+coupon+code+december+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_5f89f6dbc2c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8c4ba123bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f876895e790d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5f8abc5d89bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5f8d08d45159d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8733e46fab4.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/1/0431/5430/9280/files/83736624984.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4338/0122/files/world_in_the_balance_the_population_paradox_worksheet_answers_japan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2435/0375/files/nisefiwizaterixin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4919/4917/files/84008797199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d4b647-def8-492a-a2b2-3042d3a1d745/tagebumafex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10357805-9c8f-45c6-b770-fb8f110b1c91/stand_by_me_doraemon_2014_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00293264-376c-414a-b379-b42365328109/11921349005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebd65ade-e52c-40ab-bcad-ad5f3bb12513/90641010472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8411/1267/files/xamemogezafekidimarutiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2174/5823/files/70036829730.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_off00006f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6F 5912 bytes
SHA-256: 67881e7a69622ad7e480ff239255dd76a50b0583e9614fdae1213e77084e3e03
font_01_sfnt_off00008365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8365 2576 bytes
SHA-256: 996382fad57a23984ba0b4fb2a2809de1f5db83cdbf685c08de2ed7ddc9153f6
font_02_sfnt_off00008e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E82 13584 bytes
SHA-256: a1f9732852f50b9ec92f7ced93e7e1fe04772a205e7e759facbd08f4fea4fb30

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