Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84941d2efd905ff…

MALICIOUS

PDF

45.7 KB Created: 2020-09-05 20:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac552b82dc648491bb70dc29a73e3dad SHA-1: e7ac2ab8b6b9ace9918d08f709b8be4210625e0b SHA-256: c84941d2efd905fff0f35a46f317850a7fe40f75ba23c9b0236b80dc188737f7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=exercicios+de+transforma%25C3%25A7%25C3%25A3o+isotermica+isobarica+e+isocorica', is designed to redirect users to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, with numerous external links, many pointing to static.usrfiles.com. 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=exercicios+de+transforma%25C3%25A7%25C3%25A3o+isotermica+isobarica+e+isocorica
    • https://static.usrfiles.com/ugd/5ed537_c6c68ed1ee864340ab99c70939e14518.pdf
    • https://static.usrfiles.com/ugd/87fdc7_1baab8aacb3e42fab7c2df28aad89ece.pdf
    • https://static.usrfiles.com/ugd/2486b5_faacd7507ade4a60a6565e820cb6c3b7.pdf
    • https://static.usrfiles.com/ugd/a640e9_b164a4a192ce4a6189e2441cfed83039.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6975/files/zuzizakorodewugom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/13220831197.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4977/files/19332957626.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/80685675018.pdf
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/attestation_de_stage_exemple.pdf
    • https://cdn.shopify.com/s/files/1/0467/9938/8823/files/marvel_avengers_alliance_2019.pdf
    • https://static.usrfiles.com/ugd/0baf77_0cf210fd7dbc4fa39a8349977521bf49.pdf
    • https://static.usrfiles.com/ugd/4fb05f_0ad0563f0aab4978940e19c3a12abc4b.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_off0000618b.bin
2b6ade90ca699990180461cc959907d169a384f5b78a5f33273afedd8d2454d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618B 5588 bytes
font_01_sfnt_off0000738f.bin
b4e8d9cbeac49f4f262e26d32b2e1109908be1d1b4da93142ef3b2ff75518768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738F 12232 bytes
font_02_sfnt_off000098bf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BF 4324 bytes

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