Malicious PDF — malware analysis report

Static analysis result for SHA-256 d525e6fe96204c51…

MALICIOUS

PDF

42.4 KB Created: 2020-08-06 20:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eb6ff6d999a571761acfbe15ce2388b SHA-1: 983ac4a5753c619154505a60a9ab2ad039b9dcf6 SHA-256: d525e6fe96204c5176a2c2ffcefd675ce17e5b056cf84966f5e5fc77e9297766
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely to obscure malicious destinations. The ML_NYX_PDF_MALICIOUS model also strongly flagged this file. The primary malicious URL identified is https://ttraff.com/pify?keyword=physiologie+tube+digestif+pdf, which is likely used to redirect users to a malicious site.

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.com/pify?keyword=physiologie+tube+digestif+pdf
    • http://files.ell-lady.com/uploads/1/3/0/7/130739895/roxesifoxoxede-bajikipoz-xakeroxofev-mitevokilavepo.pdf
    • http://gomaxulo.westernenglishsetterclub.org/uploads/1/3/0/8/130874522/c4d86b.pdf
    • http://files.deborahshulmanmsw.com/uploads/1/3/0/7/130775023/ximepevotajowu-suwopegure-kigupul-rovizumesewadu.pdf
    • http://files.copiermaintenance.com/uploads/1/3/1/6/131606268/xaberusegobevafut.pdf
    • https://cdn.shopify.com/s/files/1/0432/1083/4077/files/you_can_draw_in_30_days.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/13347575880.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuzodatusowajukekef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vonabubabosutogoxofe.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/31839665876.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/busidododurezuzuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/69388588946.pdf
    • https://cdn.shopify.com/s/files/1/0438/8149/6744/files/rorebepilotajidave.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/sojaxiri.pdf
    • https://cdn.shopify.com/s/files/1/0430/5145/0519/files/12407401536.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/53181979511.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/system_analysis_and_design_4th_edition.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006682.bin
a15df1e3f575482a28f37237b8394d59f0b8c3fc602844214e12af198e7982b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6682 5240 bytes
font_01_sfnt_off0000785c.bin
83047f8124d8c63c218a02b8b5916d97dadd0f9d6ee733636a015f4266a3e6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785C 10848 bytes

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