Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79677be9a7f3f5f…

MALICIOUS

PDF

43.6 KB Created: 2020-08-22 06:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 029e74c7dc79315703cefec1e2a9f8f4 SHA-1: ded353417d5007b79d40873e3d8df71634e9308c SHA-256: d79677be9a7f3f5f804b9d35c2fef03266e3ccc5f12fbff5ff56ebff95e820d2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an invoice, intended to lure users to a malicious site. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent. The document body, though heavily obfuscated, contains text related to 'auto repair shop invoice pdf' and the embedded URL points to a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=auto+repair+shop+invoice+pdf
    • http://sidep.cedarkeyoutfitters.com/uploads/1/3/1/4/131437254/2238326.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3176/files/34689733113.pdf
    • https://cdn.shopify.com/s/files/1/0438/5826/4229/files/odnoklassniki._ru.pdf
    • https://cdn.shopify.com/s/files/1/0433/4367/5560/files/tolapowokamosukawiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/zezepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/71489960747.pdf
    • https://cdn.shopify.com/s/files/1/0433/2630/8510/files/getebepijerowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/i_love_money.pdf
    • https://cdn.shopify.com/s/files/1/0437/0615/5173/files/agriculture_upsc_notes.pdf
    • https://cdn.shopify.com/s/files/1/0429/4367/6582/files/37882370150.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/79738568260.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/sigma_notation_properties_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0440/3403/1766/files/billies_bounce_bb.pdf
    • https://cdn.shopify.com/s/files/1/0462/4374/1845/files/roborovski_dwarf_hamster_care_sheet.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_off00006c37.bin
220fd6ab9bfd709c1789484954f999cbb1d7a3be3b120e1b1d02c4a2b7a49b77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C37 5260 bytes
font_01_sfnt_off00007e14.bin
4497f5e206c8f9a4a2548d3e41aea671879b5d1741513a3d3337dfe393feaf33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E14 10352 bytes

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