Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae636bf433373ef1…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 11:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa98bae5d19b21fcbd66a105e6d335b6 SHA-1: 45faa9279e87eb19edbb019b538c0f700cf45cee SHA-256: ae636bf433373ef1baa77dfc82f0a1906348bb5071919d56e7d43ddaabe81f6f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link to a redirector, which is designed to obscure the ultimate destination. The redirector points to a PDF file hosted on a CDN, likely as part of a link farm to improve search engine ranking for malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass security gateways. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/pify?keyword=kgb+archiver+for+windows
    • http://files.kalaitzakisdesigns.com.au/uploads/1/3/1/0/131070098/xafokalofote.pdf
    • http://files.antiquesg.com/uploads/1/3/2/7/132740424/bf8e42ff1d.pdf
    • http://xalat.kateholland.com.au/uploads/1/3/1/6/131606339/c45c53d47f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7370/7925/files/xolizukisajivesamuzibat.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7377/files/speedy_current_affairs_august_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4533/files/tenidopukapa.pdf
    • https://cdn.shopify.com/s/files/1/0440/5228/3542/files/tewekesabezinexeginuku.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5379/files/picsart_hack_apk_revdl.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/boom_beach_apk_mod_android_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0775/files/the_canon_s_yeoman_s_tale.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_off00006196.bin
252fa33516265e568fe8dbb66f8865c51979f94f331258fd50bab58e1add3f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6196 5512 bytes
font_01_sfnt_off0000746a.bin
ee7c66d5fc0cc6f016e83d13bfd9dd90daf5d760c23faf9e345ff18326428227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x746A 10776 bytes

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