Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b195c455d3f5d06…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 20:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e3ae160de641f724c5d094eca29458e SHA-1: fd1fce4d06e8c2fd7a63769772a164b3d5990d2a SHA-256: 0b195c455d3f5d0694284095fad9ab21cf29f6a53c63cbf79a60ec7cea7d72aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to obscure the malicious destination. The ML classifier 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://ttraff.cc/wix?keyword=douglas+county+high+school+course+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9757e7_53db2a5a1adc4bbbabdd5339405b3803.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc5c1ca9c9a94096a5d4d6580337202a.pdf
    • https://static.usrfiles.com/ugd/9d869b_21e7a6c481754bee9b0cc7b16971696c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1748ed109e5443f8844708c35c88e09b.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/70221663685.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9762/files/27632399760.pdf
    • https://cdn.shopify.com/s/files/1/0435/1839/4523/files/37939673272.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/el_almacen_de_las_palabras_terribles.pdf
    • https://cdn.shopify.com/s/files/1/0433/3957/9546/files/kukobexejeruxef.pdf
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/koviminumaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/23160807695.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9942/files/bowknot_design_platform_espadrille_wedge_sandals.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/59394740785.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/autacoids_and_related_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/bhikkhu_bodhi_books.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/ms_access_database_software_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b8f.bin
d4eeaa8802e7685e4f8f4a2f15c95efa6e7cd2c5e7f223230756e8e2393f71be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B8F 5300 bytes
font_01_sfnt_off00005d98.bin
049454cd8cea06cc3d99cc25136780c0741f417716f6e99ea329f4f339190e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D98 9976 bytes

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