Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bfb9750822c141…

MALICIOUS

PDF

48.6 KB Created: 2020-08-20 10:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9deec98732495fa03ed788f273cfaf5 SHA-1: 938762c968b43f59622e9e49370af87db65dbf3c SHA-256: a1bfb9750822c14132a4ed382f4fcc5dd0ff500cb3e719e004c487fcc2c40f68
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'hunter killer rating parents guide' and includes the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector.

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/pify?keyword=hunter+killer+rating+parents+guide
    • http://xamakog.yellowsubmariner.com/uploads/1/3/0/9/130969204/9bcc5fcfadbff.pdf
    • http://nokezexug.nyimafoundation.org/uploads/1/3/1/1/131164250/xanazofanokalix-ritadek.pdf
    • https://cdn.shopify.com/s/files/1/0459/2241/8839/files/62339979679.pdf
    • https://cdn.shopify.com/s/files/1/0430/8520/1561/files/kixewa.pdf
    • https://cdn.shopify.com/s/files/1/0430/7009/5521/files/82843081106.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/maworevudu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6695/6707/files/70963913764.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/75976633404.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/76486679360.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/poxuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3768/files/zelda_ocarina_of_time_3ds_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/mevonibuzuxutenulexowejil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0440/6686/5302/files/73973611810.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_off0000806e.bin
57ba625d84752b123de90ddfeb0e09ddcd793580f9d67cba639b6ed66a52ab5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x806E 5152 bytes
font_01_sfnt_off000091f6.bin
3ea78c15bdf6562977531b492e5564f5abaf4de6c3b3e5e8500dfba72b0acc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91F6 10536 bytes

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