Malicious PDF — malware analysis report

Static analysis result for SHA-256 636bbb13220c0c9d…

MALICIOUS

PDF

59.1 KB Created: 2020-08-11 21:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3360986cf7802911a0d1f2058b950662 SHA-1: d9bcf1e4b9d5d2e02a8f25f2d9e45196de91cd11 SHA-256: 636bbb13220c0c9d9a606a1889b719954434a39ab0f9ae18ddd28e92f28be7ed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=system+analyst+definition+pdf`. The ML classifier strongly indicated maliciousness, suggesting the primary goal is to redirect users to potentially harmful content.

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=system+analyst+definition+pdf
    • http://files.resourcesforthesoul.com/uploads/1/3/1/4/131452861/zewusanukafa.pdf
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://wewox.rleveille.com/uploads/1/3/1/4/131454065/zefipipul_xunuwesaxikavo_lilutetebaw.pdf
    • http://files.nbbankruptcyattorneys.com/uploads/1/3/0/9/130969809/7805a.pdf
    • http://faxafixo.defiesmeasurement.com/uploads/1/3/1/6/131637316/476471.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/7988/4195/files/95148114051.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/xebipurobonitudin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/fejozaloli.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/benidutibuno.pdf
    • https://cdn.shopify.com/s/files/1/0430/4633/8709/files/arbatel_de_magia_veterum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81159011373.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/27063425297.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/98808547764.pdf
    • https://cdn.shopify.com/s/files/1/0437/0314/0517/files/articles_on_islamic_banking_and_finance.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/61204672279.pdf
    • https://cdn.shopify.com/s/files/1/0435/8832/1435/files/40380805924.pdf
    • https://cdn.shopify.com/s/files/1/0429/8106/4853/files/ford_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/bejenimivo.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f37.bin
7dff1f658c9300858cc593f2fde0cba182294aaccc42b13c821728b058afcab6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F37 5084 bytes
font_01_sfnt_off0000806a.bin
c1410b5849ac3d3a652a2ece24cab642edb9fa3d25ec4cdbfb836fbda9b031b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806A 11916 bytes
font_02_sfnt_off0000a622.bin
66c73c3d074ce0257bbd4f4e0ee742a6825eef80ac545a58d3762df4ddd6a854		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA622 12808 bytes
font_03_sfnt_off0000cf18.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF18 4324 bytes

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