Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb85c80af59052a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-11 05:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99f1ca76f35b5ca5f8c198e6be9dca59 SHA-1: 38c716c985dfb9a8d54261094d416163f5006b5a SHA-256: 2eb85c80af59052a8dd93838f878ea426c1cfe7fea563df5e2b800190ee4b508
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=us+history+pdf+worksheets, is designed to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to the topic 'Us history pdf worksheets' and the malicious URL, indicating a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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=us+history+pdf+worksheets
    • http://files.carpediem-photo.com/uploads/1/3/0/8/130874205/f1d461fdb.pdf
    • http://files.jewelerinthewoods.com/uploads/1/3/0/8/130813413/bosumuke_bawagevejin.pdf
    • http://files.woodstockumc.org/uploads/1/3/1/1/131163669/a9cc1bb77c8.pdf
    • https://cdn.shopify.com/s/files/1/0431/4143/1464/files/84737100732.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/fekef.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/91866762937.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6009/files/xazanutejozemup.pdf
    • https://cdn.shopify.com/s/files/1/0441/2401/2696/files/football_weight_training_program.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/pdf_braille_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3507/3440/files/xozamanobixe.pdf
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/benson_idahosa_sermons.pdf
    • https://cdn.shopify.com/s/files/1/0430/8572/5850/files/curso_de_adestramento_de_ces_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0441/4416/5016/files/bomuwap.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/4370184031.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/96993030938.pdf
    • https://cdn.shopify.com/s/files/1/0430/5800/4117/files/customized_worlds_mod_1._13.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_off000060e3.bin
9a93f7b6d3e05e29c3731f3911be3060989a4e1543a935484042d38e31758cd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E3 5136 bytes
font_01_sfnt_off00007275.bin
5166c74a0b2b1b9cbb9a6790dc98e7d32773a11551e028a2e2eac494292c553f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7275 10296 bytes

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