Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c041037b31ebad8…

MALICIOUS

PDF

42.6 KB Created: 2020-08-24 14:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeb2209ad672453bb053b8acb52ff2a3 SHA-1: 6dea8f88b81c298824f98b6b9a7cbc3bf7f8a4d8 SHA-256: 2c041037b31ebad8600b6c85a9982ee14daef239e072c8c81827785179d47fbb
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'maths indices worksheet pdf' and the primary malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly.

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.ru/pify?keyword=maths+indices+worksheet+pdf
    • http://files.thechristophersingers.com/uploads/1/3/2/6/132681560/8188803.pdf
    • http://foberida.strumtherapy.com/uploads/1/3/1/0/131071073/6375756.pdf
    • http://files.fraynesharon.com/uploads/1/3/0/7/130739490/75cfd5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4369/1419/files/wexuladixe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7157/0069/files/pifanuzupavujolikexuson.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/tata_sky_channel_number_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/70668863987.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/liforududuzemajiliwetujut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/74552651763.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80278007767.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/73738179682.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8124/files/66624432045.pdf
    • https://cdn.shopify.com/s/files/1/0437/3820/2273/files/datura_seeds_trip_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/www_att_com_olam.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/7685521875.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_off00006786.bin
cb85e14809c53e3c9259c95c97a43fc49ee296ebf4f131e159453a2111d1ca45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6786 5372 bytes
font_01_sfnt_off000079d4.bin
6946b5ec36e1ed9dc4150dd2b2ef3809aa74357e7f8e0e4cf6dabe325ff551a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D4 10456 bytes

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