Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ffc181de122c8c…

MALICIOUS

PDF

44.0 KB Created: 2020-08-20 06:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a749d590808044ce88552aad530c6d SHA-1: cb00abcb2bb175839f828156ce0c84a5ae071bd3 SHA-256: c6ffc181de122c8c06bf70635faeafcc67befdd73527af2bdadf21d84753684a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=cisco+webex+room+kit+plus+manual, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a malicious site. The presence of numerous other links to Shopify-hosted PDFs, some of which are benign, indicates a link farm strategy to improve search engine ranking and potentially mask malicious activity. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=cisco+webex+room+kit+plus+manual
    • http://files.westernwc.info/uploads/1/3/0/9/130969300/9471533.pdf
    • http://files.mylincolnmusic.com/uploads/1/3/1/6/131637218/8633970.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/alphonse_daudet_les_etoiles.pdf
    • https://cdn.shopify.com/s/files/1/0436/0162/5252/files/sbi_bank_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/format_code_integer_python.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/3278886935.pdf
    • https://cdn.shopify.com/s/files/1/0436/9675/0742/files/77813367882.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/bexanexixirimenetabato.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/46807805016.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/ketuwumugaxadaj.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/47927719364.pdf
    • https://cdn.shopify.com/s/files/1/0437/0094/5048/files/definition_of_adjustment_in_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/corazones_rojos_letra.pdf
    • https://cdn.shopify.com/s/files/1/0432/5516/9186/files/sawakolowizinutuv.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_off00006150.bin
953e9d68987f4953765020f133d12506d0bd50e7e78920c57a666d10e8df1d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6150 5348 bytes
font_01_sfnt_off00007378.bin
fb1488e8ab9b421803025f4a1449c76544f807c49825117ca07aef740b14703f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7378 9900 bytes
font_02_sfnt_off00009514.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9514 4324 bytes

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