Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f291bb15bee7973…

MALICIOUS

PDF

38.8 KB Created: 2020-08-30 04:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e39dbdad764a2534d922b92c5692fd9 SHA-1: 5aa43f2eafc6ec80d1421ad35d7838f557885912 SHA-256: 1f291bb15bee7973f275247c446266373f66f2df2dbaaa4f7a7ec3b29a6ec515
128 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a common tactic for SEO poisoning or redirecting users to malicious sites. One of the primary links, 'https://ttraff.com/wix?keyword=tomato+toeic+speaking+++writing+flow+pdf', is flagged as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with 'https://static.usrfiles.com/ugd/b8c837_757eb45f7b604307b38eaf564db98e1c.pdf' being the first in this farm. The presence of a 'Visual download / call-to-action button lure' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

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.com/wix?keyword=tomato+toeic+speaking+++writing+flow+pdf
    • https://static.usrfiles.com/ugd/b8c837_757eb45f7b604307b38eaf564db98e1c.pdf
    • https://static.usrfiles.com/ugd/e8506d_337e180f05fc4991ab6812d3f7d4ba0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b71340a52ce44950926d405c7b26cc05.pdf
    • https://static.usrfiles.com/ugd/23b571_3132d0febd8546d58866a53f03e2bc54.pdf
    • https://cdn.shopify.com/s/files/1/0434/6694/8773/files/beechnut_apple_juice_scandal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/feduwezugesafefadopoxam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9003/5366/files/rudram_tamil_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/43889090386.pdf
    • https://cdn.shopify.com/s/files/1/0434/7179/8436/files/bavugudivedejarivuluva.pdf
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/96143037221.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/99956248808.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/1999/files/47797699724.pdf
    • https://cdn.shopify.com/s/files/1/0435/1836/1755/files/dasapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0364/9954/files/luveraponado.pdf
    • https://cdn.shopify.com/s/files/1/0430/9578/5629/files/44019762991.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8849/files/annabel_karmel_weaning_book.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_off00005896.bin
cc5f1ccb2692cf8fe4a333d886d720b70b2bb8ade97e18011ff430189800e0b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5896 5580 bytes
font_01_sfnt_off00006b8d.bin
7c45826f48990f6e28b49a4c4bb1ace73442e08a74af3cee3ae9aab16c41189d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8D 10244 bytes