Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5240158b2833ec…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 12:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf0edbbf2fe2a12bdef6e18cca20ff5e SHA-1: e62cf1cc5c6ac3069f8015ccd554b100f573d241 SHA-256: ac5240158b2833ec867adbcfd25a4a06ec7723d00ad6b2789425ec6be2dfe77e
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=livros+carl+rogers+pdf', is designed to redirect users to malicious infrastructure. The document also contains a large number of external PDF links, characteristic of a link farm, with many pointing to benign Shopify and usrfiles.com domains, but the primary malicious intent is the redirector. No scripts were extracted from this sample.

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.cc/wix?keyword=livros+carl+rogers+pdf
    • https://cdn.shopify.com/s/files/1/0434/6966/8517/files/14490551396.pdf
    • https://cdn.shopify.com/s/files/1/0437/7221/5448/files/aaranya_kaandam_screenplay.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/rekugufolawofuxuwefil.pdf
    • https://static.usrfiles.com/ugd/b8c837_63aad2c1a8234b43a7d25d63c193b7e7.pdf
    • https://static.usrfiles.com/ugd/4c1554_176b2d4d97f543879a103ef5370280c8.pdf
    • https://static.usrfiles.com/ugd/69695d_d1982e6c50aa4aaab8fe215df961fa85.pdf
    • https://static.usrfiles.com/ugd/136d07_6203f1560d584a10bf3d88c9a672780d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9173/9295/files/capsa_susun_mod_apk_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/xudefafesetek.pdf
    • https://cdn.shopify.com/s/files/1/0436/4537/0518/files/pathogenesis_of_type_1_diabetes_mellitus.pdf
    • https://static.usrfiles.com/ugd/93c935_18c588fab9da4b659e78e5ef792d0166.pdf
    • https://static.usrfiles.com/ugd/b8c837_b78163a9bbf3495c8c4378ef908fa1d9.pdf
    • https://static.usrfiles.com/ugd/8ab72e_32e765e967e440b791358d2b89a8070f.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf741a8d945f49c5a699f7df45f2abdf.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_off000068d5.bin
5f2fbd31d39c543085799570af464952000cf6bd5de4a29d6b880e494ff90299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D5 5324 bytes
font_01_sfnt_off00007b06.bin
6b018eef4e3aa4d01f15537675af7faeaa3b29492133247afb28509b724b7f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B06 9972 bytes

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