Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ad9aeadba23628…

MALICIOUS

PDF

45.5 KB Created: 2020-08-30 23:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b69a5f529fa0064cff20f0f47160884a SHA-1: 79498c55eb359a9a0ed7a537cd2db34ab2aa8589 SHA-256: f4ad9aeadba236287802d2799f7d2f1dca75c3eb8be392d247647cfc862c5988
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a redirector to 'ttraff.ru' with a query for 'expressvpn torrent download'. This indicates a likely attempt to drive traffic to potentially malicious or unwanted software download sites. The ML classifier also strongly flagged this PDF as malicious. 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.ru/wix?keyword=expressvpn+torrent+download
    • https://static.usrfiles.com/ugd/b8c837_5b07c5737e394be2a518881186bb99aa.pdf
    • https://static.usrfiles.com/ugd/04e6f9_2a87482849cc473eb58056e216d64df2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c046e6c9db3f4ae79f7e44e1e978235e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d0a4264b1b4400e996c6dcdbdfc7837.pdf
    • https://static.usrfiles.com/ugd/b8c837_085437aa8ead483f82bd694a5c504171.pdf
    • https://cdn.shopify.com/s/files/1/0429/3584/5017/files/19815522106.pdf
    • https://cdn.shopify.com/s/files/1/0460/3546/8452/files/50601822368.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/75404444851.pdf
    • https://cdn.shopify.com/s/files/1/0431/5152/4008/files/5646234256.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/us_constitution_amendments_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/susaxikidanogofi.pdf
    • https://cdn.shopify.com/s/files/1/0464/1174/3400/files/77574110749.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_off000074f4.bin
add7f08441b7ba43895b5344c10a82c6849eb16ef5c8723013f676a37a1e52c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F4 5128 bytes
font_01_sfnt_off0000868e.bin
c669a75f7328c1d3284f085060e5fa2a34e892e727b9315592d69b6ca34ef53f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868E 10444 bytes

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