Malicious PDF — malware analysis report

Static analysis result for SHA-256 a254cd7c7de81630…

MALICIOUS

PDF

41.4 KB Created: 2020-08-25 17:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d536b7296ae2ed5c05bd1aff11c61b SHA-1: 4a8476c2fd7d4d646f1a4fe58e3fcf59d25bff3f SHA-256: a254cd7c7de816303c335bfc5f1d73e2d0a4b5b714372bd8e7476312e3fbe98c
130 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Splunk regex cheat sheet PDF'. This URL, https://ttraff.ru/pify?keyword=splunk+regex+cheat+sheet+pdf, redirects to malicious content. The file also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of a link farm used to improve search engine ranking for malicious sites.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=splunk+regex+cheat+sheet+pdf
    • http://files.civil-vapes.com/uploads/1/3/1/4/131453684/kakoziwedi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6701/3280/files/sex_games_cancun.pdf
    • https://cdn.shopify.com/s/files/1/0434/5105/6284/files/fuvamabanovijafofip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/kozewuzogovujal.pdf
    • https://cdn.shopify.com/s/files/1/0457/4783/0940/files/mopubalar.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/cheat_brawl_stars_mod_apk_android_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4188/1253/files/personification_worksheets_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/6686/8383/files/xuxovoxazezisekab.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/bootstrap_mega_menu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2089/2834/files/hometown_glory_sheet_music_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6541/files/26292574806.pdf
    • https://cdn.shopify.com/s/files/1/0435/7252/7267/files/list_of_excel_formulas_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/53821160430.pdf
    • https://cdn.shopify.com/s/files/1/0434/1481/4885/files/fokekipufupofofafolerewe.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_off00006005.bin
6fa86d988df9af4f1f3f7ab57daf21200bfa80c8a3e79751a816fb260dd90694
pdf-font-stream PDF embedded font (sfnt) at offset 0x6005 5652 bytes
font_01_sfnt_off00007338.bin
a04c931e8141ba70f150c19a2c204995207f058799663850cfcaebcb561c8df0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7338 11172 bytes