Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e87076bbde0b9d7…

MALICIOUS

PDF

56.9 KB Created: 2020-08-13 06:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03c80315f78586e882867c1ef2f2565f SHA-1: 0b9add0dc52c0be9eb5ab5f45bb652bf9da9c0f1 SHA-256: 3e87076bbde0b9d7e214bd39841c9e7ecdb88c4becbd17082eeb8f2c83c173a2
150 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, disguised as sheet music. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates malicious intent. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics, reinforcing the malicious redirector link.

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/wb?keyword=shape%20of%20you%20guitar%20sheet%20music%20pdf
    • http://files.apronstringsllc.com/uploads/1/3/0/7/130739214/widaleb.pdf
    • http://zaven.josiediamond.com/uploads/1/3/0/7/130776046/rejezikuguwutako.pdf
    • http://files.banvej.dk/uploads/1/3/0/9/130969693/dufonovusadawilune.pdf
    • http://vemira.anchorchristianacademy.org/uploads/1/3/2/6/132681352/219976.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/jajewewogijavonegewodinag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/gopuxopobutos.pdf
    • https://cdn.shopify.com/s/files/1/0431/1721/5905/files/77123579467.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/calendario_agosto_2020_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/16478280432.pdf
    • https://cdn.shopify.com/s/files/1/0440/7836/6885/files/82587842551.pdf
    • https://cdn.shopify.com/s/files/1/0434/5767/5431/files/dell_2330dn_driver.pdf
    • https://cdn.shopify.com/s/files/1/0430/4742/0066/files/kokerokekojevarexelumu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/losaredevapewiwumujutor.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/57599699481.pdf
    • https://cdn.shopify.com/s/files/1/0431/2589/9421/files/toxok.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c73.bin
e3a780bb9c6db613b45fdcc31f238e8ea8f684e197e1b839a7d5544c67178b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C73 5516 bytes
font_01_sfnt_off00008f41.bin
caa163d0ef99a738d1672207b0ced07950f4f167d5ccd12040177f5e839a0b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F41 10492 bytes
font_02_sfnt_off0000b374.bin
b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB374 16100 bytes
font_03_sfnt_off0000c844.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 4324 bytes

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