Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a4fc682333c1fc…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 10:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e378a8bddd825af63c181b2cd3f4103 SHA-1: d6b8ce8934794ea7385092289c2d338eb9f91b43 SHA-256: b2a4fc682333c1fcd386819d6eb2078ec6a727ad2f5c8ecefccf69f99eab95ca
120 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, disguised as a printer driver download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK firing confirms the primary URL leads to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of embedded links, many pointing to benign Shopify URLs, but the presence of the malicious redirector is the primary threat. No scripts were extracted from this sample.

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.com/wix?keyword=hp+c4180+printer+driver
    • https://cdn.shopify.com/s/files/1/0428/1021/2518/files/neumonia_por_varicela_en_adultos.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/69036506722.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6841/files/55489952893.pdf
    • https://cdn.shopify.com/s/files/1/0430/0986/7929/files/lopanawag.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f18b93e00c5441d98dc47483d6ac28a.pdf
    • https://static.usrfiles.com/ugd/5926b4_734dbd33a83642e1ad853815e70b20e9.pdf
    • https://static.usrfiles.com/ugd/191a6d_57981e2229414650884dcfcbeaa67884.pdf
    • https://static.usrfiles.com/ugd/15cd4d_08de9f7faab546caaa7c49aa3e42cdc7.pdf
    • https://static.usrfiles.com/ugd/f65518_4a97697da4524b7e9a6c1255b6310773.pdf
    • https://static.usrfiles.com/ugd/60933b_4574f6912f0f476aac588749a95fbf6c.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/baxejefejodufarenabipo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/adolix_split_and_merge_professional_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/2279/4395/files/30116836474.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_off00006b7b.bin
779e348695bc88ac5a8a193694e6079c11b480d1d7a2dd43b46d02eda6232a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B7B 5144 bytes
font_01_sfnt_off00007d1c.bin
116ddfb8ddbe508586372b35fea86c93e936c09f7b38434f721c408e2096ee0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1C 10032 bytes

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