Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc06f949184141c1…

MALICIOUS

PDF

39.8 KB Created: 2020-08-21 00:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db54262cad4b6a1e3a64f4f0ec0c098 SHA-1: c184a596a4a7c9590ff0915bce3120fe5ad8757c SHA-256: fc06f949184141c12319fde26e4c692c5cb5fc333df47b9797ecc933c722e604
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, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'captive portal login' and the malicious URL. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring the user to a malicious site via a link disguised within the document.

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=captive+portal+login+keeps+stopping+android
    • http://files.franklinpres.org/uploads/1/3/2/6/132681885/4627395.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/tamil_boy_baby_names_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/2168/0283/files/fararila.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/16044237591.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/bootstrap_material_datepicker.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/51373086602.pdf
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/salem_s_lot_2004.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1384/files/all_racing_games_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4683/8176/files/76165386392.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/45923979747.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/tudo_sobre_piscicultura.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_off00005cfb.bin
1a680079ca3ac5e2f6f1d28f52f8f083f7f93ae2dbf3b02a5f9de6eb762a37ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CFB 5156 bytes
font_01_sfnt_off00006ea0.bin
06112ed651f29cfb5f70815211a79d8f1aefafd0e9bd93d771aaa666024fda6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA0 10540 bytes

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