Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a7cbedb3513c73…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 18:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6290b0799b91fc406d544913fab92b2d SHA-1: 649bc0cc0acba83b8781eaa5f9655086049fc7af SHA-256: c4a7cbedb3513c73d0917bbf528d838976af54afff7a7e26ffa39abf13f19216
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link farm and a direct link to a known malicious redirector, ttraff.ru. The document body, though heavily obfuscated, contains text related to 'Seek thermal compactpro ff android', suggesting a lure to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve search engine ranking for 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/pify?keyword=seek+thermal+compactpro+ff+android
    • http://vikofe.veryreadable.com/uploads/1/3/1/4/131437607/846723.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/wokojikok.pdf
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/45283890018.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/36832545496.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixedazatujiguxup.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/first_day_of_kindergarten_printable_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/tijujukusakipora.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/94220672076.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65760981278.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3462/files/kappler_level_a_suit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0451/0436/5721/files/html_responsive_table_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/nirupinemefiwof.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/83419426237.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_off00006855.bin
6084e90cf809c025e2fafa8290d635fb6de152060d745bf7189fb218edea2dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 5384 bytes
font_01_sfnt_off00007a75.bin
b3075564e72e8b20afb65d80f66dfb5aaad366ad4f8af89563fe47ca2f863989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A75 9668 bytes

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