Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ec9ef9b02cb4c…

MALICIOUS

PDF

37.9 KB Created: 2020-09-03 00:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd7e92b0a97cbefc894b00cf853bb8c0 SHA-1: 2321f75ab83cba68e0a8f21b01f37ebde2f4b23b SHA-256: 8b8ec9ef9b02cb4c86eca8598e9bbb4c20e52b17bc817453e4a2c16b594abeab
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, ttraff.link, is identified as a malicious redirector. The document body, though heavily obfuscated, contains the string 'Notruf 112 android' and the malicious URL, suggesting a lure related to emergency services for Android devices. The ML classifier 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.link/wix?keyword=notruf+112+android
    • https://static.usrfiles.com/ugd/dd6616_c86fabb84cae4907b10df1ecfd83cdd9.pdf
    • https://static.usrfiles.com/ugd/122077_02c4649dc6ac423699ca2a4f84e83a94.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_d22549d33f12423c90b69a7d7de84386.pdf
    • https://static.usrfiles.com/ugd/409ca8_bd079d1df4d24dc0a1e5b3bd71263f9c.pdf
    • https://static.usrfiles.com/ugd/18574e_67abd3f8e30f43f1af1415d185a5e972.pdf
    • https://static.usrfiles.com/ugd/5b5da7_50eaea28806b4340b7f07ed06423aaa2.pdf
    • https://static.usrfiles.com/ugd/dd6616_000e7258377449969162377cbff352b1.pdf
    • https://static.usrfiles.com/ugd/99a8f2_4df83d7d4945473e9057b0b8b9a40bcc.pdf
    • https://static.usrfiles.com/ugd/18122d_2f7efa523b3b493c9eaa6674dec85a73.pdf
    • https://static.usrfiles.com/ugd/0adedf_1616790f454240a3a0d8b38a809f46e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1aa3331b76b4f1cab0b80ad2e97d24b.pdf
    • https://static.usrfiles.com/ugd/455f95_a58f08262ce44ffbb473f3dd9bd6da11.pdf
    • https://cdn.shopify.com/s/files/1/0438/8365/9419/files/87586352476.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/remewamafim.pdf
    • https://cdn.shopify.com/s/files/1/0438/6865/1680/files/bal_ganesh_2_photos.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_off0000536e.bin
b28bc149016693df9753ebc35356784f5b51344dcf11ed5bd8f0a1346754c92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536E 4844 bytes
font_01_sfnt_off000063fc.bin
9bc5398355f783400efb4bb518f4610daa844f6a92b1d14e0a4d1dbc67863cd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 11516 bytes

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