Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9b4750adb1c5d3…

MALICIOUS

PDF

66.3 KB Created: 2020-08-13 04:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8d2a5edc1b88565f1da2aa54006e77e SHA-1: b948c3e233e58579b853cdb6cb18e3fc0857e988 SHA-256: 3e9b4750adb1c5d3c96af21a83b881043b5e975af73602a3b1cc72ae572feb53
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. This URL is embedded within the document body, disguised as a link to a nursing textbook. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm intended to obscure the malicious redirector. The ML classifier also flagged this PDF with high confidence.

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=brunner+and+suddarth+medical+surgical+nursing+12th+edition+pdf
    • http://files.shelbyveterinaryservice.com/uploads/1/3/0/7/130740180/58a409d.pdf
    • http://vekapigo.thelaurenwalker.com/uploads/1/3/1/4/131453278/remuli_babugeji.pdf
    • http://files.pentepoets.com/uploads/1/3/1/8/131871912/buxazaj.pdf
    • http://files.ayalalandalviera.com/uploads/1/3/2/6/132681985/533e0261a59.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2084/files/84877780768.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/75666223511.pdf
    • https://cdn.shopify.com/s/files/1/0429/6320/6307/files/mofigiwekavinevabipejite.pdf
    • https://cdn.shopify.com/s/files/1/0429/6661/4175/files/critical_thinking_skills_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0428/3927/7734/files/getubebifemulinijowegekix.pdf
    • https://cdn.shopify.com/s/files/1/0430/6249/3345/files/kosipidakafigiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/rational_and_irrational_numbers_activity.pdf
    • https://cdn.shopify.com/s/files/1/0447/5063/5162/files/physical_science_grade_11_caps.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7957/files/anhelos_del_corazon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baca.bin
e99c128c10675a98be93be623b65c3f52e77d220206c86ba8c6651f70caf1f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBACA 5800 bytes
font_01_sfnt_off0000ce62.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 1800 bytes
font_02_sfnt_off0000d6ef.bin
6be42247258d7b28afcfde7c739be036f66fb82ee9aa746dbc313fb6bf16b8ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 10512 bytes

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