Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e47f24548af8d0…

MALICIOUS

PDF

42.8 KB Created: 2020-08-31 11:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b681495fbd54ce25483fea2ea7108616 SHA-1: 0d909ac3f73b3b5f18a54f3460a231475a3317ef SHA-256: c3e47f24548af8d00584ee4818ff5f7bf484bd15913f98aaffd8ef3d05a2e1a1
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The primary malicious URL is https://ttraff.ru/wix?keyword=caracter%25C3%25ADsticas+de+los+monosac%25C3%25A1ridos+disac%25C3%25A1ridos+y+polisac%25C3%25A1ridos, which is likely used to lure users to a compromised site. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a link farm or SEO poisoning tactic.

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=caracter%25C3%25ADsticas+de+los+monosac%25C3%25A1ridos+disac%25C3%25A1ridos+y+polisac%25C3%25A1ridos
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/50796458141.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/cancionero_catolico_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7651/8049/files/jeguvosigutapunika.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6421/files/maripumefaxigowuxifofowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8218/6905/files/the_adventures_of_huckleberry_finn_mark_twain_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/vazezobagofoleguxitog.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/16935368814.pdf
    • https://cdn.shopify.com/s/files/1/0437/4347/7909/files/baxolirujami.pdf
    • https://cdn.shopify.com/s/files/1/0432/4186/5375/files/ignou_b._ed_online_application_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/kingdom_hearts_2._5_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3109/files/the_5th_wave_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/takaraduten.pdf
    • https://static.usrfiles.com/ugd/e5a943_e8161844327645e190612efda6c44a71.pdf
    • https://static.usrfiles.com/ugd/f65175_b148d2f974004c84815b0d2ddbb07143.pdf
    • https://static.usrfiles.com/ugd/b8c837_2118bb7747e146ccbc5113a3c7f1e372.pdf
    • https://static.usrfiles.com/ugd/6c032c_f91ed09dc3594c6697ac26e83a5c9bde.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_8152fe009b4244dab5cc0b5a0097c45e.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_off0000644d.bin
cb8da87dbd46f94c5543b8268b57bce02aac2b9da5f7425c23399717342a6040
pdf-font-stream PDF embedded font (sfnt) at offset 0x644D 5516 bytes
font_01_sfnt_off00007666.bin
6fb2fcc64e6ea0c684dffe3c2224ddadd0f2f4d9c237eee43cbd3bc4a721300e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7666 11184 bytes