Malicious PDF — malware analysis report

Static analysis result for SHA-256 21eb2cd3a5313e22…

MALICIOUS

PDF

46.1 KB Created: 2020-08-18 15:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ab2ead167169ba3d65aaa0ebefefaab SHA-1: 7af87c3b44e181220f2b8bf3ee0920117def79b2 SHA-256: 21eb2cd3a5313e2296ca9a9e0671f6c06f9fd7475e82712645ba760f5042d80d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=cooking+academy+4++full+version'. This URL is presented within the document body, disguised as a download for 'cooking academy 4 full version', indicating a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=cooking+academy+4++full+version
    • http://files.whatsthequestion.online/uploads/1/3/1/3/131380397/lurud.pdf
    • http://lijex.asyouwishuk.com/uploads/1/3/1/8/131856772/2725413.pdf
    • http://gafexazu.mendinginvisiblewings.com/uploads/1/3/1/6/131637136/9484968.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/kozatulepi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/gilit.pdf
    • https://cdn.shopify.com/s/files/1/0439/9041/7566/files/luxekumizamux.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/13837869900.pdf
    • https://cdn.shopify.com/s/files/1/0429/6327/1833/files/file_ko_cho_in.pdf
    • https://cdn.shopify.com/s/files/1/0438/3807/9138/files/35063734864.pdf
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/53882637885.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/assessment_for_learning_tools.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/81497999224.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/p_l_and_balance_sheet_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006543.bin
4c889a751391da87bec01231fbeb23122dcd56eea558e924282f286dba25cb65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6543 3796 bytes
font_01_sfnt_off000072c1.bin
9baabfaaa23585bc8453d01963d9a16a8c2eb68930aeb41131dba3e4d6b7d142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C1 5560 bytes
font_02_sfnt_off000085ad.bin
ec9906b7878cdaab63a31619e483fb2f87ae96b6442d0cf7caf6d86867ed6f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AD 11328 bytes

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