Malicious PDF — malware analysis report

Static analysis result for SHA-256 b297fb6d5e1063a7…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 11:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bbb85fde1482665a2ee6fd7334a44f6 SHA-1: 49abd5bf7912f2325ce98b4335ba085690c614d6 SHA-256: b297fb6d5e1063a7e9f1e1062601e38fc00f1f26a88efbdd86ec5456455c1782
120 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to known malicious infrastructure, disguised with a keyword related to AutoCAD Civil 3D 2020. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The document also contains a large number of embedded links, as indicated by PDF_SEO_LINK_FARM, suggesting a link farm or SEO poisoning tactic to distribute malicious content. 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.ru/wix?keyword=autocad+civil+3d+2020+new+features
    • https://static.usrfiles.com/ugd/89c6ad_a73d4c5b92a045f1b6fc18078c6057aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_4067f030bbc34bd2a813cea1e1f03e85.pdf
    • https://static.usrfiles.com/ugd/b8c837_012eaa64d26d44bcacde788e94d234b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad51b6408ef4ed9af97f2a90451d3d1.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/73612273621.pdf
    • https://cdn.shopify.com/s/files/1/0439/2203/0760/files/english_to_urdu_meaning_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/8537517908.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/28077287194.pdf
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/bae_suzy_wallpaper.pdf
    • https://cdn.shopify.com/s/files/1/0432/1955/0370/files/98234517928.pdf
    • https://cdn.shopify.com/s/files/1/0437/7395/2158/files/17643132290.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/54932703239.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/lafujixewetubifebatogoraw.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_off00005ef7.bin
6a8090be8f05050c438e7122baffbde2c67b3fbed8f6f7919b7211f141595427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF7 5596 bytes
font_01_sfnt_off0000721b.bin
b642e2af52291ff654b972070e6c37645259d91681810b3cbb6e73742485a8b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 11836 bytes

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