Malicious PDF — malware analysis report

Static analysis result for SHA-256 9caf82cfd93749f0…

MALICIOUS

PDF

42.0 KB Created: 2020-08-20 21:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 051ec592abd070b6dc137b098e114861 SHA-1: 866477ef302e50cc86f547f4e38350d8fd065e56 SHA-256: 9caf82cfd93749f046807a97124c5a0b902daade425e00ceb7aba5239b2d9554
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a PDF link farm. One critical heuristic indicates a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to 'cvc word families worksheets' and also includes the malicious redirector URL and several other PDF URLs, some hosted on Shopify. 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.cc/pify?keyword=cvc+word+families+worksheets
    • http://files.uprisingstarsinc.org/uploads/1/3/1/3/131379045/gowofikur.pdf
    • http://diradas.missionm4.org/uploads/1/3/1/4/131406286/liforobivovig-kusip.pdf
    • https://cdn.shopify.com/s/files/1/0429/2083/7279/files/unire_file_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0438/1795/9586/files/free_amharic_fiction_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/gesidipabidupufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8382/4294/files/76316316836.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4511/files/tezeferu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6188/6627/files/24701050253.pdf
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/kibavizurunu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/the_butterfly_effect._torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4600/files/intraday_liquidity_reporting_swift.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_off00005b5d.bin
667d333d785247978d51885c0023a97035b0911e9a7495cfa2ce27f2e0b7f66d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5D 5380 bytes
font_01_sfnt_off00006d8c.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8C 1800 bytes
font_02_sfnt_off0000761a.bin
51019a519959edf9135a5e5c0ff2504d1aa61ce52f7e49d1a512f926266dfe06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761A 11516 bytes

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