Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa659fd19e5d9687…

MALICIOUS

PDF

36.4 KB Created: 2020-08-31 06:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcaa25849b58056186bbb1fbcfd55adc SHA-1: 31adc912823c64a4073778c4b2cd275505509607 SHA-256: aa659fd19e5d96875974b074e117e4fd38a4b70b8d003852fab9acd3f2f2e620
150 Risk Score

Malware Insights

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

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 suggesting it is a guidebook, which is likely a lure. The primary malicious URL identified is https://ttraff.club/wix?keyword=new+england+bouldering+guidebook. The presence of numerous PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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.club/wix?keyword=new+england+bouldering+guidebook
    • https://cdn.shopify.com/s/files/1/0434/0767/1447/files/biotic_and_abiotic_components_of_environment.pdf
    • https://cdn.shopify.com/s/files/1/0440/0339/3694/files/top_ielts_speaking_tips.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1325/files/bleacher_report_browns_vs_jets.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/sapil.pdf
    • https://cdn.shopify.com/s/files/1/0435/7688/5416/files/autoit_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/pezejubanekigedovu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/vanexabuvamopajumumajof.pdf
    • https://static.usrfiles.com/ugd/55cc32_19ead88ac2074ae294c0329853d12ba1.pdf
    • https://static.usrfiles.com/ugd/286fb8_85ecae89f47a4bcdaa5d538de6684c71.pdf
    • https://static.usrfiles.com/ugd/5b9365_c33f68e6c37e4d7ba0732e1cfee0ad18.pdf
    • https://static.usrfiles.com/ugd/4e6dd5_bcbaabcd60ba4ddcb67eaace7b19aa7b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2df443e51294c52aa94d176184f0e2f.pdf
    • https://static.usrfiles.com/ugd/5de1df_22b8e45d4384473ca535eb47793f881f.pdf
    • https://static.usrfiles.com/ugd/41a0b6_48d4ce4f553442db8160e345d397cee5.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_off00004f16.bin
496ee913244e4da176e71dd2cd43f96e0527dd453a99e40e6a64076a47cf4e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F16 5080 bytes
font_01_sfnt_off00006082.bin
dd0ab8c664c40055d80268cf146a78535134e2e7fdd45a8e29bf762908186dce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6082 10652 bytes

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