Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9836ddd821f79a2…

MALICIOUS

PDF

42.3 KB Created: 2020-08-24 21:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c0b83b9147827f0296031d145106e38 SHA-1: 29e83792f30b7f9cf38d9d9bc49eb626b96ccbdd SHA-256: d9836ddd821f79a2b4003e2cbe5fe3e11a039e7a3c4b189a24a9aee433fdb645
120 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to appear as a download source for Adobe Reader, but it redirects to a known malicious URL. The document body itself is heavily obfuscated but contains the malicious redirector URL and numerous other PDF links hosted on Shopify, likely to improve search engine ranking for malicious lures. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=adobe+reader+for+pc++free
    • http://files.mrbreen.org/uploads/1/3/2/8/132814476/67eb5ad106f80.pdf
    • http://gikakop.mustardseeds.co/uploads/1/3/2/7/132740324/4205347.pdf
    • https://cdn.shopify.com/s/files/1/0448/1551/5805/files/9083430592.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/roxudoropere.pdf
    • https://cdn.shopify.com/s/files/1/0432/1968/1437/files/84680191256.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/febevewurokudusanoxibu.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/99549145856.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/agenda_2020_para_el_desarrollo_sostenible_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0433/4636/2533/files/58759276387.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/35396397850.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/chava_kadambari_marathi_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6221/4304/files/migogajavuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7107/files/bcd_code.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/popowodibenog.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_off00006726.bin
c9fdc10ab16fca6680d11b552d1fdcc468cfc9f64205d54d0720ab2d0ab28a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6726 5068 bytes
font_01_sfnt_off0000786c.bin
6245d792414e7c429da8f451cec2387594dcc0982e542c87dc78cd89bccd7246		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786C 10616 bytes

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