Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d543a794d2b8a8…

MALICIOUS

PDF

46.0 KB Created: 2020-08-29 13:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0b8e5a59488a2c2ed88b6817c6e6ad SHA-1: e8e093c31564c75d507b285c4ca8d3e78614861b SHA-256: 96d543a794d2b8a8c678cbf7de3d27836deed9572f4a2462298cd1ca4fc5758e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=romeo+and+juliet+final+test+answer+k', suggesting a lure to trick the user into clicking the link. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm further supports the malicious intent.

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.ru/wix?keyword=romeo+and+juliet+final+test+answer+k
    • https://static.usrfiles.com/ugd/b8c837_3e8da7c8c22a446daf85dfdd6e88f652.pdf
    • https://static.usrfiles.com/ugd/b8c837_032545bc579f4844a2adcab88841ae67.pdf
    • https://static.usrfiles.com/ugd/b8c837_fac4c59fa8104c24828d72295bbfbdf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_83ed7fecf43645cf9dda821df40c48f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3887967928bd4581a8bb7ea3c48b06a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b11d34bfef5b4b889ad007d69733c5ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_492497955d6049b1af9958149695b4b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc15fbd2af7f40538e429bed6b43baaa.pdf
    • https://static.usrfiles.com/ugd/b8c837_643fd96829174a5bada6054e7027b46e.pdf
    • https://cdn.shopify.com/s/files/1/0433/9426/9333/files/xubikexovineviki.pdf
    • https://cdn.shopify.com/s/files/1/0434/9886/4800/files/nuxetajawukadibeje.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/16444827351.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/wutarojikadenelefesupumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/bitaj.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068c4.bin
133e2a8dbbdf6a59001c627cb40ea2f6116e695fd8a14d5e312ff70973f58e20
pdf-font-stream PDF embedded font (sfnt) at offset 0x68C4 5172 bytes
font_01_sfnt_off00007a56.bin
0f74f07a5b562df755a004f5ef230a36e53fc97405f868f00c257f885b63512e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A56 10268 bytes
font_02_sfnt_off00009d3f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3F 4324 bytes