Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d578c1ad0afbc3…

MALICIOUS

PDF

40.1 KB Created: 2020-09-08 04:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03812f7779b4b105498ab25bc604b2f3 SHA-1: 442fe4c8bc4ab875cf159fc830c0a6947d6749a8 SHA-256: 83d578c1ad0afbc38422ed05fccd48b9c9f8454600e30be9f582bf7aac57a1fb
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector, disguised with a keyword suggesting an Outlook 365 email. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the document structure and embedded links strongly suggest a phishing or credential harvesting attempt.

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/pify?keyword=outlook+365++email
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_74e0458252074051bff3d1f92af7861c.pdf
    • https://static.usrfiles.com/ugd/733c1f_be0c39e9b0f44cc88006cf1cd26ea417.pdf
    • https://static.usrfiles.com/ugd/46429b_ca565cb826904d5fb28f8dd354c81a46.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d3269b0839740d79e79dbe27f89ce81.pdf
    • https://cdn.shopify.com/s/files/1/0445/8368/2212/files/65842454267.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/najazejopele.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/bleacher_report_college_football_week_5_picks.pdf
    • https://cdn.shopify.com/s/files/1/0458/1346/5254/files/73002501740.pdf
    • https://static.usrfiles.com/ugd/e1d12c_5fd975e3fe0c4adeb9ef04a3f60d424a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2767276865b445a984e67149a6852f62.pdf
    • https://static.usrfiles.com/ugd/43d598_76f29f342ed94b42947b901d926b3716.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_230c2bf8072140af8f6eaf74229e7771.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/wexopuzet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9681/files/bawupaluw.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/3000_questions_about_me_download.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_off000060b1.bin
f4cec7350af74adc049bc0e31cfd567cf225654375b2048098b4e5bc95eba58f
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 5088 bytes
font_01_sfnt_off000071f2.bin
04f22e4c34f87ccf6191e29519996d30ac241de1fec391529bf382ecdf39c960
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F2 9908 bytes