Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a826aa2089ec02…

MALICIOUS

PDF

50.4 KB Created: 2020-09-05 07:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d290ce6cd82b71727f713cc27f3d9a31 SHA-1: 3c8506eab23a9066923c99baa8eda2e6194fc9f6 SHA-256: 73a826aa2089ec02aa4675b534e7a519746801b757be9a5d67d8b343416bd893
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, forming a link farm. One of the primary links, https://ttraff.me/wix?keyword=ethical+dilemma+questions+and+answers, is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing.

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.me/wix?keyword=ethical+dilemma+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9374a7_6cfac5c67ad641069c2f25db07b693a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_52420dc35d35428d9fabd42195870765.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b01fce332ca45c4a411548e81fdf31c.pdf
    • https://static.usrfiles.com/ugd/a3b54b_5a98c50e9f444cbe91b88aaa32f4bc1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c274e91da040459b9796b3f7d95bebb5.pdf
    • https://static.usrfiles.com/ugd/837d34_04b9391f6cbd4f18a843773ff86eeac2.pdf
    • https://static.usrfiles.com/ugd/3b7182_cb01458f943b47718951374323fc9f00.pdf
    • https://static.usrfiles.com/ugd/e56fe2_92a211c268a248b58f8d00e2f1b9fdc6.pdf
    • https://static.usrfiles.com/ugd/dad7b5_68bdb0287c6b4f739ea29f69516d9c4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5f7a0aaf34f9e8a31f1af57986d26.pdf
    • https://static.usrfiles.com/ugd/5be868_ca59ab04450146e5839c9436c5f88675.pdf
    • https://static.usrfiles.com/ugd/a12125_c98b4b6c8084410389b379d0281b174c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e3f30dc7ec04e13856d12694b8d1fbd.pdf
    • https://static.usrfiles.com/ugd/b910ae_98b23c66740c4fc89e3228ab32335368.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_off00008660.bin
43cd4cdddcfb3723a350acab70253ff281e60a862b84a4e9678b41d58b572e78
pdf-font-stream PDF embedded font (sfnt) at offset 0x8660 5356 bytes
font_01_sfnt_off00009876.bin
a5d051fe99ec332accaadc1d5b887840e8307764d5e5ad64b5b0751d71774ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9876 10716 bytes