Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fbce83e94523df…

MALICIOUS

PDF

60.4 KB Created: 2020-08-31 04:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 610aa086844550b3c27dad91ca3556f2 SHA-1: ff7d910e7ea346dd9510d43b459d4f096b55c62e SHA-256: 44fbce83e94523dfe2bcc577fb7a669dd40f6eaab0408ea3c477b1712a07948f
120 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure containing a link farm. It includes a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to `https://ttraff.ru/wix?keyword=star+trek+online+andorian`. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, with `https://static.usrfiles.com/ugd/b8c837_727865dd33a7465a8431009af0051858.pdf` being the first identified. These findings suggest the document's primary purpose is to lure users to malicious sites.

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=star+trek+online+andorian
    • https://static.usr
    • https://static.usrfiles.com/ugd/b8c837_727865dd33a7465a8431009af0051858.pdf
    • https://static.usrfiles.com/ugd/b8c837_91508e7358304576842ae55e365186eb.pdf
    • https://static.usrfiles.com/ugd/2b25e8_c5dda3c792cf48e38ef20bf108d5b75f.pdf
    • https://static.usrfiles.com/ugd/0779a3_ec0b20477d1a4c47ac9184857099cf16.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/algebra_1_practice_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/30434975180.pdf
    • https://cdn.shopify.com/s/files/1/0440/0830/8901/files/companions_baldur_s_gate.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1413/files/apus_launcher_ad_free_apk.pdf
    • https://static.usrfiles.com/ugd/b8c837_72115776a4274be4a9a49a3aebd463b9.pdf
    • https://static.usrfiles.com/ugd/5cf23b_e7f9c070812a4d1da55e2d501bf353d6.pdf
    • https://static.usrfiles.com/ugd/917232_11215fc7234346dfac1dc7e43e4222d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d86661d72384d4a871cc108e663307e.pdf
    • https://static.usrfiles.com/ugd/0c4177_e16aaa82f42d485ba8759d1f55a01d52.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_off0000b188.bin
2794482e36505a65ef0df66f26f6178e6f15a16f0424121f438c5c154a2a9fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB188 4808 bytes
font_01_sfnt_off0000c1e0.bin
df0570a7d8f28d00e6db890e1c7c5f92bd74fa0882084f3b162e3edc4d935e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 10156 bytes

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