Malicious PDF — malware analysis report

Static analysis result for SHA-256 214b2db67947c904…

MALICIOUS

PDF

62.6 KB Created: 2020-08-31 14:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c780ec146e69ec2367a75532307e07f0 SHA-1: e4d5067f0afd483c68203b1860d95f3589520085 SHA-256: 214b2db67947c904092aa79b6d60423f3d4e258353560ec704a871510535bec1
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL and the document body suggest a lure for a 'car racing game install'. The ML classifier also strongly indicated maliciousness. The primary IOC is the redirector URL, which is likely used to serve further malicious content or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=car+racing+game++install
    • https://static.usrfiles.com/ugd/696b8a_ef45161f04604230a2ba0aab0ab13a9b.pdf
    • https://static.usrfiles.com/ugd/bf0735_d5469eebb4c2476f8e799865d59c669b.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_c4590f36d3c84835b596ea3704cb691b.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/buffon_histoire_naturelle.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8019/files/teams_by_affiliation.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/fazonoxolowaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9713/6030/files/velako.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/18064116683.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/january_2020_calendar_marathi.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_off0000b9e4.bin
ed135e0ffcaa66f69a57fe32e9ae8c1f679e89f1840fdb09a9fd514a07f43bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 5024 bytes
font_01_sfnt_off0000cadf.bin
9998f3188b512101d3ce0244ba1ee546e1527c5f61b4f83970d4f7464f93450e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 10192 bytes

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