Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ae8425fec75dd…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 07:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 106811829be778e8ee8f9bcc4c561173 SHA-1: fe98d442338d90fa958fa5d3c12708f605583ab8 SHA-256: 852ae8425fec75dd91cec210770c5be0aa86afb3497e172f9266a5def5315bf2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF document contains a lure related to 'solucionario matematicas 4 eso bruño opcion b' and embeds a link to a known malicious redirector at 'https://ttraff.ru/wix'. This redirector likely leads to further malicious content or exploits. The document also contains a large number of embedded links, many pointing to 'static.usrfiles.com', which is flagged as a link farm. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=solucionario+matematicas+4+eso+bru%25C3%25B1o+opcion+b
    • https://static.usrfiles.com/ugd/374ce0_7eac0f84eb744d19ae45f849f260edce.pdf
    • https://static.usrfiles.com/ugd/b4609a_75bb84c7931446769569a193933150e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb02df74e0c4388b2052b7cbe492e65.pdf
    • https://static.usrfiles.com/ugd/ac72e0_014d521e39e04d7ca04cd81cb68b229f.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_e19cb74c847c4695a1a9c286c37321df.pdf
    • https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_fb5d2c8962d84b288fe0bfb20cf46655.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a9fea88f0240649fe5c4050693dea6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a46d5b8ab294e7a97e3382c3e3bb177.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/37715125574.pdf
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/paxaxeputodakukazo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/tarapamubaxafewi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/canciones_infantiles_en_ingles_y_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/0993/1424/files/66863655322.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://static.usrfiles.com/ugd/7f46b5_8169b7ec299f4bdeb22993b2cd3dc015.pdf
    • https://static.usrfiles.com/ugd/b8c837_8766446a74dd4406a44874d7c1faf0f0.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_off000049bd.bin
a26a4a707f1b50efc408eea6f18401bf015352dcd5b38809c51350ad5f4cd692		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49BD 5624 bytes
font_01_sfnt_off00005c73.bin
fb9b7e2e814b8d60db3bbc252d76fa279410450eec625878b023a0f836fc73a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 10156 bytes

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