Malicious PDF — malware analysis report

Static analysis result for SHA-256 c900c2b1e3b20961…

MALICIOUS

PDF

48.2 KB Created: 2020-09-01 01:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8f7a4a6da01f0033f3eba37c56a25d2 SHA-1: 104604d5b52582db725df6e7e4b2e09651705495 SHA-256: c900c2b1e3b20961594fd8a987cc018663f29f60d427c1cef69fbbc4bea37cc8
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking it. The presence of numerous other links to benign-looking PDFs hosted on static.usrfiles.com and cdn.shopify.com suggests a link farm or SEO poisoning tactic to improve the ranking of the malicious PDF. No scripts were extracted from this sample.

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/wix?keyword=famous+news+reporters+names
    • https://static.usrfiles.com/ugd/7e0eb0_de2b76341453467a950cbde06c852dd0.pdf
    • https://static.usrfiles.com/ugd/23e9be_36060128e54c47c9a89b92b162842391.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b9cb5c199cc34bbfacb8095b087f9e56.pdf
    • https://static.usrfiles.com/ugd/e2c250_9e563d4730ee4b9e816d7cafcf171b04.pdf
    • https://static.usrfiles.com/ugd/66c878_f6f6dd87d7a347688c914c9cf9ac1c3e.pdf
    • https://cdn.shopify.com/s/files/1/0429/6815/4278/files/que_son_las_bacterias_mesofilas_aerobias.pdf
    • https://cdn.shopify.com/s/files/1/0438/9352/2587/files/49699273339.pdf
    • https://cdn.shopify.com/s/files/1/0434/4161/9100/files/o_mio_babbino_caro_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/tebeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/zumilulajejaporukuludu.pdf
    • https://static.usrfiles.com/ugd/1f2646_3edbec5662f741819fc24788f47cfd1a.pdf
    • https://static.usrfiles.com/ugd/1be480_7380145ea6a241a7bf2c59460a7bbbae.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_off0000737d.bin
236785cffaa8f362f9e6ef7735ce86a284a878ce56c0c0aafbea4663192a726f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x737D 4816 bytes
font_01_sfnt_off000083ca.bin
a5e66b2b3f82f30be161c410dc6879a9fce9a4857048e6057399cc6938a6ab83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CA 10032 bytes
font_02_sfnt_off0000a623.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA623 4324 bytes

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