Malicious PDF — malware analysis report

Static analysis result for SHA-256 315293e7325b08ed…

MALICIOUS

PDF

40.1 KB Created: 2020-08-18 15:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 061ade3382edf8e26637a2d77afb6809 SHA-1: 85353384bcf89ecd6742ac3934bcb629c4cd49c3 SHA-256: 315293e7325b08edac1c355d7e45290a7b9d5c26954f5b25b78cc630e589d00f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.ru' which is associated with malicious activity. The document body, though heavily obfuscated, contains text related to 'Spotify android app quality' and the malicious URL, suggesting a lure to download or access something malicious. The presence of numerous Shopify-hosted PDF links, some confirmed benign and others unknown, indicates a link farm strategy. 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=spotify+android+app++quality
    • http://files.deckthewards.co.uk/uploads/1/3/1/6/131606248/wusofizak_kazoronasuto_vitolusa_nugutaxiwej.pdf
    • http://files.alexandraportersoprano.com/uploads/1/3/1/8/131856170/27766764a64.pdf
    • https://cdn.shopify.com/s/files/1/0440/9117/9160/files/99473002001.pdf
    • https://cdn.shopify.com/s/files/1/0428/6709/7756/files/candy_crush_soda_mod_app.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/76727041816.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/brother_dcp_l2540dw_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0429/4397/1484/files/pibokopevipeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/rafepituwatigebukus.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/numenera_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/7050/4608/files/tor_browser_for_chromebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/6th_grade_math_test_printable.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/kekanonakixaputal.pdf
    • https://cdn.shopify.com/s/files/1/0434/5328/4519/files/super_mario_bros_nes.pdf
    • https://cdn.shopify.com/s/files/1/0434/6567/0806/files/44500762479.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_off00005e80.bin
d3ca7f0d9555a843952b3d0f3d37f5944170c6b0a174aae01071ae9214ac2815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E80 5188 bytes
font_01_sfnt_off0000702c.bin
4bb51325b7dfcbaa3b93e82f17fe6869dbc73b253789991c5239025bf51aa2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702C 10460 bytes

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