Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf851c2581faf549…

MALICIOUS

PDF

56.0 KB Created: 2020-09-01 11:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c4fa1561879aa23c3a68fb154b6fcec SHA-1: bd73c71448e3087539bcb68026466fe08da98cd9 SHA-256: cf851c2581faf549ce371cf2fbd997bf1f128e84813353bd22e2e7a80ecce762
128 Risk Score

Malware Insights

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

The PDF file contains a prominent link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_LINK_FARM heuristic indicates the document is part of a link farm, likely for SEO manipulation or to distribute malicious content. The SE_DOWNLOAD_BUTTON heuristic suggests a lure to trick users into clicking the link. The embedded document body, though partially corrupted, contains the malicious URL and references to other PDFs, reinforcing the malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=emoji+pictionary+bridal+shower+game+answers
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/pijinotesas.pdf
    • https://cdn.shopify.com/s/files/1/0434/3732/6502/files/system_design_definition_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2874/files/assimilation_in_phonology.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3c561d49f9c4aaa833ece0aa19a4986.pdf
    • https://static.usrfiles.com/ugd/e78b77_cb432a52c36746ccb6378172052aa0b0.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_b8a8be81d4a347c3a46f40798e94f95a.pdf
    • https://static.usrfiles.com/ugd/6d59ab_5171860ad0204d359bcb854b3cef149e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0443642c601b4e79819d2d3219442d66.pdf
    • https://static.usrfiles.com/ugd/b3bc21_8dd66482dea64c82b26b55f57e360f24.pdf
    • https://static.usrfiles.com/ugd/e73fea_9b8c2ee7d86e44038c702d454d211197.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/darobitiwimibolesar.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4661/files/27234552458.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ae1.bin
12ac6fdfdf19bb4165c8581e1465f6f9b7241438a5162bab04a7025a64f5a75e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE1 5644 bytes
font_01_sfnt_off00006dea.bin
141e4cabe929f842b0c5a59afce2526565ac0fe28457f9527e4b730898aa9dda
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEA 6244 bytes
font_02_sfnt_off000083ed.bin
7a3a3393bdd96defccc8eafcb149613ea778111233d8a1e1b5ef0829113c5e35
pdf-font-stream PDF embedded font (sfnt) at offset 0x83ED 13348 bytes
font_03_sfnt_off0000aef1.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF1 16204 bytes
font_04_sfnt_off0000c420.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC420 4324 bytes