Malicious PDF — malware analysis report

Static analysis result for SHA-256 c897b0b0f8f57205…

MALICIOUS

PDF

53.7 KB Created: 2020-08-30 06:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1bf2ca8ab6b15a59272237f3e1ccb63 SHA-1: 0b1f06f7abe40a09285d8c51e1e2923504d09286 SHA-256: c897b0b0f8f572051e0d36111e6e60e720652e3e885d85ddac1c4d892c95a823
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to engineering drawings and includes the malicious URL. The heuristic firings confirm the presence of a malicious redirector and a link farm, indicating an attempt to drive traffic to potentially harmful sites.

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/wix?keyword=engineering+drawing+lettering+numbering+and+dimensioning+pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/norewet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/72750614084.pdf
    • https://cdn.shopify.com/s/files/1/0429/7441/2949/files/lenev.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1417/files/introduction_to_thermal_and_fluids_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1798/files/chemical_engineering_science.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3a5991bec5e4334a69d2fa0767e093f.pdf
    • https://static.usrfiles.com/ugd/bfbc46_c5f360c413594465874e8bca87a90c92.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/liwukepurenugiweda.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1065/files/porogomemuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/datopozobozunumud.pdf
    • https://static.usrfiles.com/ugd/73cb9e_53688037988f4673b591e65cadf529e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_af64b28627cd4bec8224d9ecbae77549.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007945.bin
64ac8a57635ea964187e5e87f35b62dad3ddf775aa69a643c0b3cd69b05b70da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7945 6416 bytes
font_01_sfnt_off000088e0.bin
af38b7f2844c254bb95ba8e882764f137c1264e9bc66e231e5655c0760a9e202		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E0 2856 bytes
font_02_sfnt_off00009319.bin
c53fd42a29cec791eb7e3e5878dd2f292898f932ea1de6e3e1c97c029b65b1d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9319 5548 bytes
font_03_sfnt_off0000a5f1.bin
0f434c494b3ac33dc551f58ab9cf22f5ddf3c221a54a645eb0b9f926f4ff1d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F1 10124 bytes

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