Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4cd5d8a386e7c3…

MALICIOUS

PDF

55.5 KB Created: 2020-07-31 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a688d3318998a3e7b6ba9800d4565834 SHA-1: cbf72dbde8638c42507f807edef35d8005720fa0 SHA-256: 7d4cd5d8a386e7c3951ec71a4516203464d0270610a1ab400aabde3b2d771dc6
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=calculus+ii+problems+and+solutions+pdf'. This URL is likely used to redirect users to further malicious content. The document also contains a large number of embedded links, many hosted on Shopify, which is flagged as a PDF link farm. The ML classifier also strongly indicates maliciousness.

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.ru/pify?keyword=calculus+ii+problems+and+solutions+pdf
    • http://files.beautifuleggsbyjane.com/uploads/1/3/2/7/132712006/zogubawovi.pdf
    • http://files.wwvmc.net/uploads/1/3/1/4/131409090/wogigomak_dawevajuvezo.pdf
    • http://files.noellegracephotos.com/uploads/1/3/1/4/131437380/wonolebinonivow_nudozez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/somunojoduzujebudanixe.pdf
    • https://cdn.shopify.com/s/files/1/0437/2247/3624/files/wefolagimi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1681/files/kagasatagiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/39212458911.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/71196208961.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/95258496341.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/kekofovoworuxojazowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0742/7238/files/55563973371.pdf
    • https://cdn.shopify.com/s/files/1/0434/7835/2034/files/97931422625.pdf
    • https://cdn.shopify.com/s/files/1/0432/9147/6133/files/fodukerofemizabupigizose.pdf
    • https://cdn.shopify.com/s/files/1/0430/4375/0049/files/jifitipuxadarovitojajek.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zadolodiwifunum.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/tevarebu.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/
    • https://cdn.shopify.com/s/files/1/0440/8056/2326/files/392

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008feb.bin
386a8dc4430ccd26668f9be242df65e298fb24727ec9bdf6d546b328102a8670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FEB 5344 bytes
font_01_sfnt_off0000a1f2.bin
258db5bac9f79144682384279a3eb57d66704deba9b7dd1ed5f3b397bd8319d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1F2 15056 bytes

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