Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f1b5bc86d0eb7f…

MALICIOUS

PDF

50.1 KB Created: 2020-08-30 03:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc979324160ceb0a32bc4deb8ecf6c5e SHA-1: cece3d884dc572c18596bbaa8e30faf0d778e572 SHA-256: e1f1b5bc86d0eb7fb1accdc83bda875e5dc2ae0e56a640da304976d34e5f0646
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a known malicious redirector, and the document body contains numerous links, including the primary malicious URL and a large number of benign-looking PDF links hosted on static.usrfiles.com. This suggests a tactic to either lure users to malicious sites or to manipulate search engine rankings.

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=4j+student+vue
    • https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
    • https://static.usrfiles.com/ugd/87b9a8_05f39084ad8b473fa169a6fbbd3df782.pdf
    • https://static.usrfiles.com/ugd/b8c837_71f8c17080884841932376b293b9c202.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f081abeecd44937b1d33a71207e0eb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28ad10048174f96ad44a077dbc55c73.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_e2a7da5eae2e4760b3aa254b04b28878.pdf
    • https://static.usrfiles.com/ugd/9757e7_6023c2fd70b44c8cb7a5eda92584554a.pdf
    • https://cdn.shopify.com/s/files/1/0466/5232/6053/files/natugirodewusoruzuzomi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9289/3093/files/lugaroja.pdf
    • https://cdn.shopify.com/s/files/1/0440/5143/1574/files/bank_po_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6704/files/different_styles_of_leadership.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/76039106102.pdf
    • https://cdn.shopify.com/s/files/1/0428/5356/4583/files/99108556011.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069dc.bin
11510712eea96ae8555b6c7ed8f80368a15ca52cb94e58c91024705171d7a497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DC 4612 bytes
font_01_sfnt_off000079aa.bin
e40afb49ff9284879fc6ddbdc89fe5b4b63e1f246cb2f4b20e5211b0b04c1e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79AA 11912 bytes
font_02_sfnt_off00009ff2.bin
244d3d0ff0b26e529ecb9eca382960acccd2f89e542b2ccd65c0a95b9f1261e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FF2 18120 bytes

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