Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a88ee33e1ada04…

MALICIOUS

PDF

33.7 KB Created: 2020-08-10 05:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f2b0f70d98e547a2ba7b6948927434b SHA-1: 6f90eff853fb943c9a027e6c3c53714f2c344b76 SHA-256: b3a88ee33e1ada04aff6f7a34e33b64dd65d4496e126ac0711561aa54d33fa56
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic firing indicates that the PDF links to a known malicious redirector infrastructure. The document body itself contains obfuscated text and a URL that appears to be a lure for a PDF download, which is then redirected. This suggests a phishing or redirection attack aimed at leading the user to malicious content.

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=mathematical+modeling+of+physical+systems+an+introduction+pdf
    • http://files.allfloorsinteriors.com/uploads/1/3/0/9/130969375/kexajize.pdf
    • http://vudajiw.searchlightforensic.com/uploads/1/3/1/4/131407406/5e1d879724f0ce9.pdf
    • http://nujaw.prli.us/uploads/1/3/0/7/130775795/sotuxadapilodi.pdf
    • http://files.savepleasantonneighborhoods.com/uploads/1/3/2/6/132695596/ratef.pdf
    • http://pezimemig.groundwaterscienceandsustainability.org/uploads/1/3/2/6/132682124/motenetatuwegele.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/telisoriwus.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/au_agenda_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/lubikiguwu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/bowel_obstruction_in_children.pdf
    • https://cdn.shopify.com/s/files/1/0431/4906/6397/files/21474162848.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/61252489071.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/cetosis_en_rumiantes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/opie_heart_physiology.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/libake.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2824/files/circuit_breaker_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/8947/5237/files/38015416.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_off000048e2.bin
359a556d194ac8e36331d02366c4a6279427f7e047fb362e0e63897ea1389ca7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E2 5676 bytes
font_01_sfnt_off00005c26.bin
2f5fdcc7b9406306983f9eb7646d9f71e8d59380810bebcf529ee5e53feeab0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C26 8568 bytes

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