Malicious PDF — malware analysis report

Static analysis result for SHA-256 e738f52157927ae5…

MALICIOUS

PDF

45.6 KB Created: 2020-08-23 08:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5332ae1486f1cc1eeae6db8ff26cfca0 SHA-1: 544e547b6bdf3d8f6c5b88fad1014a0d47f4d401 SHA-256: e738f52157927ae5f5da87e46452ecd2af5306fd021f08c4c18b11cfd8366846
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'addition word problems 3rd grade pdf' and includes the malicious URL. This suggests a social engineering attempt to trick users into visiting malicious sites under the guise of educational content. The primary malicious URL identified is ttraff.ru, which is used as a redirector.

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=addition+word+problems+3rd+grade+pdf
    • http://rutidojus.letmommyread.com/uploads/1/3/1/4/131408899/senivovugativ_zitibomusibabit.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/fujukajeja.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/importance_of_boundary_spanning.pdf
    • https://cdn.shopify.com/s/files/1/0432/9232/8102/files/gimazuxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/0795/9452/files/nevuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/enlace_ionico_y_covalente_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/nejelujufinukedikoledex.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/66905532632.pdf
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/kevajoxubufulagigig.pdf
    • https://cdn.shopify.com/s/files/1/0431/1960/7962/files/test_driven_development_for_embedded_c.pdf
    • https://cdn.shopify.com/s/files/1/0439/3782/4926/files/astronomy_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/99636104470.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/pugudivofosodofoxurekux.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_off000074cf.bin
4686d54997f575a7b09683c7286506bddc0473b3bff1c631aa32bc6be8f2b16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CF 5748 bytes
font_01_sfnt_off00008853.bin
85e4055cea11c31b7e17735501a1416c93972f145166874af0757d460b393b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8853 9772 bytes

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