Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4744f2a6aefebdd…

MALICIOUS

PDF

68.8 KB Created: 2020-08-08 09:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d25c831c46f70e1fe80e1b699c6d025 SHA-1: 72939121181c2042e270966bc1b54c4d3e0c039d SHA-256: b4744f2a6aefebddf6240c0195c5cc9099c12c26c3dd9bdb5c307525b593c117
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 the presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious redirector infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic fired, revealing a large number of embedded external PDF links. The primary malicious URL identified is https://ttraff.ru/pify?keyword=list+of+vocabulary+words+with+meaning+pdf, which likely serves as a redirector to further malicious content. The document body contains garbled text but includes the same URL, suggesting it's embedded within the document's content.

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=list+of+vocabulary+words+with+meaning+pdf
    • http://files.fdragflorida.com/uploads/1/3/1/4/131438453/8315535.pdf
    • http://files.cool-solutions.org/uploads/1/3/2/3/132302859/lexoxaziseloxod_ruzedibesunogap.pdf
    • http://files.bloomingfulbirths.co.uk/uploads/1/3/0/9/130969371/4362299.pdf
    • http://files.kohicleaningservices.com/uploads/1/3/0/7/130775245/nesaniwiwekijen.pdf
    • https://cdn.shopify.com/s/files/1/0431/4234/8949/files/4783824712.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/sulezawovidurojalijibedeb.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/pevebovanilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/damegadunuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/96272862951.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.pdf
    • https://cdn.shopify.com/s/files/1/0440/1332/2398/files/bulats_writing_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/9677/6607/files/61690101895.pdf
    • https://cdn.shopify.com/s/files/1/0434/5964/1496/files/77109189118.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/irrigation_engineering_by_rk_sharma_free_download.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_off0000ceb2.bin
c3dfe872f910b5691b5571bc66045017308ff37bc3de7dba978bffbbe0b24e59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB2 5904 bytes
font_01_sfnt_off0000e2c1.bin
33a57d4be830ecf37a7e5f91e6717b5b12415aa4c214972769200277a6ee490e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 10468 bytes

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