Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe492038cb8e43a…

MALICIOUS

PDF

41.5 KB Created: 2020-08-01 03:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c25fe05c29f2170083a404bfd8bd5558 SHA-1: 012bb186f91d0065c62d2d95b6daa3585e774d07 SHA-256: 5fe492038cb8e43a4c8fcc86a7072762daae8c884b0f8f7d0209ef0dd52e304c
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent link, 'https://ttraff.ru/pify?keyword=convert+jpg+to+ai', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, indicating a likely attempt to drive traffic to malicious sites. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious redirection campaign.

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=convert+jpg+to+ai
    • http://files.stmarksnspfoundation.com/uploads/1/3/0/9/130969748/sizotobitexot.pdf
    • http://files.somersetcommunitymission.com/uploads/1/3/1/3/131380767/jukefokewijug.pdf
    • http://files.patakai.co.nz/uploads/1/3/2/6/132695428/17374.pdf
    • http://files.charlotteshelix.net/uploads/1/3/0/7/130776490/ba638a3.pdf
    • http://files.ewisely.org/uploads/1/3/1/4/131407028/rasop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/rusadumufoxojipopokaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/sitokedujoxaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3190/3902/files/69408984054.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/winafukafufalovano.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/25445212793.pdf
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/20130725598.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/pujaditiburi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/93197776429.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/nazorufitivek.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/los_cuatro_libros_de_amadis_de_gaula_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/zozulasumef.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7055/files/91432506881.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.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_off000065a6.bin
4f8f9e692feca73b0285f8bce83a5707d95b4338781287f33809630e4addf1dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 4816 bytes
font_01_sfnt_off00007626.bin
887324b5acf707c2f446473da1198b9aec9eb11a20680890cf80d015c6a3c4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 10348 bytes

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