Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c94e361dbb882e9…

MALICIOUS

PDF

37.0 KB Created: 2020-08-29 20:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1d23207bf05d7774dd34214829bda14 SHA-1: 22837924867c6e280039824da32c55dd8c874d7e SHA-256: 3c94e361dbb882e9a6ce0a729aedec612eaebc53a168bc6fbe3134616a155841
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This is further supported by a PDF SEO link farm heuristic, indicating a large number of external links, many of which are likely malicious. The ML classifier also strongly flagged this PDF. The primary IOC is the malicious redirector URL, which is likely used to lure victims to a malicious site.

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.com/wix?keyword=xamarin+forms+android+gif+splash+screen
    • https://static.usrfiles.com/ugd/b8c837_c5751e6bda844f2b8fa809d0d9be069e.pdf
    • https://static.usrfiles.com/ugd/0789d5_dd72136facb64706bf8ffe89d6248c27.pdf
    • https://static.usrfiles.com/ugd/bae363_1e99f8103088450aa02ba1353ade7885.pdf
    • https://static.usrfiles.com/ugd/dd4472_1ca4102e232648b5816e3ae7e641d634.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/vogazozevurutenikupo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1303/5416/files/xujedunefubivufokilavum.pdf
    • https://cdn.shopify.com/s/files/1/0428/4416/0156/files/erik_erikson_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/9597/2256/files/woocommerce_related_products.pdf
    • https://cdn.shopify.com/s/files/1/0430/6645/8265/files/79230822282.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/71386513474.pdf
    • https://cdn.shopify.com/s/files/1/0437/8886/1602/files/afnor_normes.pdf
    • https://cdn.shopify.com/s/files/1/0439/3828/3678/files/cane_s_menu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/30312421113.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/87245577397.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_off00004fa6.bin
de6634e6568da61a7d925516b328de4fa03522a3fb1b5a5ad30c6d718400ae58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA6 5544 bytes
font_01_sfnt_off0000624b.bin
71829df5d8dec784d3de0bd78ddd316399df1ebdd8ce035d3267da42ca1937b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 10732 bytes

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