Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d22918bc7dde6c3…

MALICIOUS

PDF

43.7 KB Created: 2020-09-07 16:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 431e7ae3e55f36645857174bd507bc55 SHA-1: 8d2028a488f43339e1f6d83afef129b2d65293cb SHA-256: 1d22918bc7dde6c3181654d7fdd86e86fca83b8a2a8a753fa15349ff43595a30
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/pify?keyword=obs+broadcaster+software'. This link is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, indicating a link farm strategy. The primary malicious IOC is the redirector URL.

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.me/pify?keyword=obs+broadcaster+software
    • https://static.usrfiles.com/ugd/30ea26_a0f6890a4c024837949a4ac0113970aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_835c1276d6614d6c9616b40e197738c1.pdf
    • https://static.usrfiles.com/ugd/ac72e0_7cdf10f8b44544d795ad8acfb1926775.pdf
    • https://static.usrfiles.com/ugd/8e6e76_a649f00eb9b74e7a86e86a00e8c2076f.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/handheld_steam_cleaner_reviews_consumer_reports.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/validity_and_reliability_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/0358/3384/files/dikabisilewi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/71503738785.pdf
    • https://cdn.shopify.com/s/files/1/0434/1868/1496/files/kunapobepaviwojoful.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/sarkar_south_movie_link.pdf
    • https://static.usrfiles.com/ugd/0b46e6_fbc586356a814ecb9b59b814798f2dd6.pdf
    • https://static.usrfiles.com/ugd/2e16aa_5778d83c69744686beed86b7ba0a7f74.pdf
    • https://static.usrfiles.com/ugd/4d935e_14eae69dc3044acf961f8b29d9b5f5b3.pdf
    • https://static.usrfiles.com/ugd/e33828_a65eddff58814398ad4b96c3633bf35f.pdf
    • https://static.usrfiles.com/ugd/136d3d_4924e549910c44c8a48db55dfd742611.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_off00006612.bin
a830cbc16e496aad25e51e1b773f17071226ca9bf3a3893c7713f64dc8f234cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 5244 bytes
font_01_sfnt_off000077fc.bin
cf1a0531e6a3c207a7b597288537aab7db8ba0013e9578dd54332768735a8828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FC 13440 bytes

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