Malicious PDF — malware analysis report

Static analysis result for SHA-256 7477dc64b99a1947…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 18:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5842fcdcdabb3fb3ae6dfe896764cdae SHA-1: 247c05d1d6e870891d4c8afd225978466f0945ca SHA-256: 7477dc64b99a1947b3445f437b85b44ebd39c19fb7ac8952da2dff6f95415e8e
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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/pify?keyword=asean+national+costumes+pdf
    • http://files.ambassadormoris.com/uploads/1/3/2/6/132682882/6a5aa7c954c.pdf
    • http://difakuvi.chartierney.com/uploads/1/3/2/6/132696147/329800.pdf
    • http://files.stephanvandertoom.nl/uploads/1/3/1/4/131454190/1404726.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/66059847004.pdf
    • https://cdn.shopify.com/s/files/1/0438/2500/4706/files/avg_internet_security_2016_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/civic_education_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/ar_accelerated_reader_school_cheat_answers_page.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/zubolowinijunaxijene.pdf
    • https://cdn.shopify.com/s/files/1/0433/2814/3510/files/rutuxivavaxixegaxunopepez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/rojokozazibuxojiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/precalculus_with_limits_larson.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/kabbalah_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0432/8875/6384/files/wovewozegejupodupon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b0d.bin
4b81ffe823c3ac965e7dceeacdb35cd0af89d59730e5c24511944063e462175b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0D 5076 bytes
font_01_sfnt_off00006c3b.bin
22b25ab4decd562325361b88f0fadb0b9623c2a1081e8c5be8f7599c61d5b43c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3B 9580 bytes
font_02_sfnt_off00008d04.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D04 4324 bytes

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