Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f8816ba2ff6bac…

MALICIOUS

PDF

35.2 KB Created: 2020-08-09 03:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af923e3024c87aa04160b892b2e01900 SHA-1: 87cc2e33b5991192975e4e454d6d467a61dbcc0a SHA-256: b7f8816ba2ff6bacbd144777f0546a65830275e3b5e1edbd790452bdf7d0f4b3
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector at 'https://ttraff.ru/pify?keyword=nchsaa+handbook+pdf'. This indicates a phishing or malware distribution attempt, leveraging a seemingly legitimate document to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=nchsaa+handbook+pdf
    • http://files.makeupbytaylorp.com/uploads/1/3/1/4/131407511/7965931.pdf
    • http://files.rrjerez.net/uploads/1/3/1/0/131071256/5122286.pdf
    • http://files.london-mini.net/uploads/1/3/0/7/130739399/7075795.pdf
    • http://files.amsitraining.com/uploads/1/3/0/7/130775510/xaberonodoki-wevab-poxako-tipafere.pdf
    • http://files.1stclasshomeopathy.com/uploads/1/3/1/0/131070072/nikapaminupol.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/zupurigetizuruzokejinag.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/87683402985.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/xetuvukuxorazin.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/12734549468.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/thesis_on_agricultural_extension_and_rural_development.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/20722252529.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/absorcion_de_aminoacidos.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/83913615934.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_off00004cf5.bin
45ad1d55f3d81cc0ea67c1946b0d38a065d9351cf02f8248b978a9fa1490b1d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF5 5288 bytes
font_01_sfnt_off00005ef7.bin
29d9c1418bbf4126a3f4c5f163ae96c4fb3a9d0ed52f52ddd82aef20f49760e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF7 9828 bytes

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