Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e9f4c5b350264b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-07 06:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6dee16b44ad062a1b0eec3ce9e6ef46 SHA-1: e0d3eecee5fc743dcd24e96a4a0c0dba644f3171 SHA-256: e7e9f4c5b350264b116c59dfe0ac471f7f91d104752ad2c934470cb5398e640c
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects to `https://ttraff.cc/pify?keyword=active+listening+communication+skills+pdf`. This redirector is known to lead to malicious infrastructure. The document body, though heavily obfuscated, contains this same malicious URL, indicating the primary intent is to lure the user to click 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=active+listening+communication+skills+pdf
    • http://files.sjjww.org/uploads/1/3/0/7/130739621/2543533.pdf
    • http://files.nationalchristmasgreetings.com/uploads/1/3/1/3/131380305/5991764.pdf
    • http://files.myfavoriteoldies.com/uploads/1/3/1/0/131071067/zupazufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6601/5396/files/vi_commands_in_unix.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3778/files/master_thesis_in_accounting_and_finance.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/edith_hamilton_mythology.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/rezojirufudovolaxowexeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/0006/0310/files/how_to_copy_url_from_youtube.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/fitekebasapegene.pdf
    • https://cdn.shopify.com/s/files/1/0444/0604/6886/files/pa_drivers_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/15895008435.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0446/files/agricultural_science_for_primary_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5008/2202/files/barefenikugufaxamugev.pdf
    • https://cdn.shopify.com/s/files/1/0438/9735/6443/files/she_s_going_the_distance.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_off0000691f.bin
3c7bbf9914610806545bd8eac3bc79b51e4d12b92c9ff7c226decc8d1bb3d05f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 5492 bytes
font_01_sfnt_off00007bd4.bin
1d979680038577c661c95bc71ea1ac66368b8472c2a1d0610acd1470259a8ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD4 10100 bytes

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