Malicious PDF — malware analysis report

Static analysis result for SHA-256 125e2186e7b9386e…

MALICIOUS

PDF

36.8 KB Created: 2020-08-21 14:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c803b47e425c8e9c618f01c923dd064c SHA-1: 203167df89aaf65fd8e178159fa6da95858e8794 SHA-256: 125e2186e7b9386ecd612b5f9ae7c518d27fa70b99e4e872ccffddfc52703d4f
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 hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to direct users to harmful content. The ML classifier also 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.ru/pify?keyword=forsaken+dream+theater+piano+sheet+music
    • http://nagaduko.juliathegraphicdesigner.com/uploads/1/3/1/4/131411896/56999e4f.pdf
    • http://files.countrydogscomics.com/uploads/1/3/0/7/130739811/be83886963d1d.pdf
    • http://sigal.torilaynepermanentcosmetics.net/uploads/1/3/0/8/130814328/8208884.pdf
    • http://files.amredco.com/uploads/1/3/1/8/131871785/a9ae2987c3c.pdf
    • http://files.sass-and-crafts.com/uploads/1/3/0/7/130775384/xabowutegajojifik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/katusemuxo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/gemeneniwowu.pdf
    • https://cdn.shopify.com/s/files/1/0438/5207/1074/files/manuel_pour_apprendre_le_japonais.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/wordly_wise_book_7_lesson_14.pdf
    • https://cdn.shopify.com/s/files/1/0437/9587/3949/files/99618904659.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/tegitibemikirezobut.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/nubuko.pdf
    • https://cdn.shopify.com/s/files/1/0461/6083/8808/files/baby_girl_announcement_card_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/3957/1611/files/39418881958.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_off000044f1.bin
37fa660ed73b6f5820fe7d6532f2fdb75043d8f37bdc2a589f114dba4fb3eb88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44F1 5184 bytes
font_01_sfnt_off00005663.bin
ad7b8c0d62151ab52045ad3813cb9fe2564a1dc19736ccbbfcf974edbe6b2f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5663 9776 bytes
font_02_sfnt_off000077fb.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FB 4324 bytes

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