Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd5bd1c3c25cd3a…

MALICIOUS

PDF

50.3 KB Created: 2020-08-04 20:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb1087cb8fbca328a076c6031b7864b SHA-1: eb0424c3e3dfb0931721f9458ac21baaf3daebb4 SHA-256: bbd5bd1c3c25cd3adb382a54591600ef1eccec25f9e4995d8497ef349ff128d8
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host SEO-optimized PDF files. One of the primary links, 'https://ttraff.ru/pify?keyword=bhu+ba+sociology+syllabus+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the intent is to redirect the user to malicious infrastructure under the guise of providing a sociology syllabus.

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=bhu+ba+sociology+syllabus+pdf
    • http://jofarur.braincasegames.net/uploads/1/3/0/7/130739430/8203715.pdf
    • http://files.theyogaconnectionstudio.com/uploads/1/3/0/7/130775735/7162043.pdf
    • http://files.freyawaterson.com/uploads/1/3/1/4/131453284/1622477.pdf
    • http://files.ldbeng.com/uploads/1/3/2/7/132711999/932b185.pdf
    • http://xujuxun.macgregorarney.com/uploads/1/3/2/7/132712323/jidoz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0348/5092/files/bwv_1006a_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6933/files/sugelapavi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0019/1387/files/silberberg_chemistry_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6871/1321/files/wubusitagozurabi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6852/files/lafofoxexedow.pdf
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/42937174809.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9909/files/guardaroba_perfetto_libro_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/dokijupugetosewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/bird_stewart_lightfoot_transport_phenomena.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9240/files/38294692418.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/disawu.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_off0000773c.bin
ab83190879a54dd980d1e9e574e9869b7c1372c8fe2e96ef8a809e0c780f4bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773C 5612 bytes
font_01_sfnt_off00008a5e.bin
1f64728a7a87423f0ac4b0145d97b076ad6a73449a5a22f0b31aa5f245b616df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5E 15616 bytes

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