Malicious PDF — malware analysis report

Static analysis result for SHA-256 3896860ec8c2238f…

MALICIOUS

PDF

41.6 KB Created: 2020-08-03 16:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f2455c1e0705c17cff5ad7af39a1fa3 SHA-1: db8c4f96209fdd3b95d4e22fff1615968457fb44 SHA-256: 3896860ec8c2238f824a3dc8bf0fefbd8287a25fa268b4139134bdb63b676cc6
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or redirection tactic to obscure the final malicious destination. The document body, though heavily obfuscated, contains the string 'Alphabet worksheet pdf' and the malicious URL, indicating a lure to trick users into clicking the link. 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.cc/pify?keyword=alphabet+worksheet+pdf
    • http://files.benkipiyako.org/uploads/1/3/0/7/130739379/biwumekuponukawo.pdf
    • http://files.gogiddypops.com/uploads/1/3/0/8/130814063/gazovibigeda.pdf
    • http://files.yukonhomes4rent.com/uploads/1/3/2/6/132696063/zinixemijikam.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/69227978482.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3420/files/woocommerce_ajax_add_to_cart.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72274594547.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/magic_item_compendium_3._5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8165/files/53212461594.pdf
    • https://cdn.shopify.com/s/files/1/0430/9221/3911/files/92256603267.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/livro_bachelard.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/lelekefiburitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/fundamental_mathematical_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/6005/files/namovuneroz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3391/8616/files/domozuzogasujun.pdf
    • https://cdn.shopify.com/s/files/1/0434/7622/2114/files/warren_buffett_rules_of_investing.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/winisitew.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_off000064a7.bin
0b2cc68c2355dad5b1f361efada45a94fd642b1f55bdb0d22c29ec7adb7d1bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A7 5412 bytes
font_01_sfnt_off00007714.bin
a3c2be918dbf68b0f8505f2064e9f150dc4e33c78f7635cc7fb7d35084813021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7714 10136 bytes

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