Malicious PDF — malware analysis report

Static analysis result for SHA-256 a551ff835e38bc3e…

MALICIOUS

PDF

55.3 KB Created: 2020-08-12 20:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a15b5bc2f1183e440fe77f6f10c0a112 SHA-1: 58bccc1364447caed5f6fd087b2b13c7d7422c7e SHA-256: a551ff835e38bc3e3d0da480a96a32ca358cbd24a7b658778dc34ed2c3eaa94f
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a tutorial download, aiming to lead users to harmful content. The ML classifier strongly supports this malicious classification. The presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to improve search engine visibility for 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.com/pify?keyword=apache+camel+tutorial+pdf+download
    • http://files.firstxvperformance.com/uploads/1/3/0/8/130874276/powij-sinomi-zimekabum.pdf
    • http://files.wholehealthliving.blog/uploads/1/3/0/8/130874217/tufuve-sojigobafo-dapubek.pdf
    • http://files.stjohnsallegany.org/uploads/1/3/0/9/130969352/5650234.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/how_to_delete_discord_messages_fast.pdf
    • https://cdn.shopify.com/s/files/1/0432/3033/1040/files/go_daddy._com.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/62055654417.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/adobe_photoshop_portable.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/povuvosukoxabuvekagajoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/nescafe_dolce_gusto_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/dubatijatibabexituzex.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/memofisuzunoga.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/zunanajakolamoxurezetog.pdf
    • https://cdn.shopify.com/s/files/1/0450/2038/1342/files/c._v_sample_for_job.pdf
    • https://cdn.shopify.com/s/files/1/0434/8510/2237/files/5222366445.pdf
    • https://cdn.shopify.com/s/files/1/0449/4472/0040/files/learn_body_parts_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/pixinexakusefuwure.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/sales_executive_cover_letter.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_off00008cb6.bin
1a2ee140c9bb095a90c43fee645c9ae48f910494265859b0131e923aeb626a9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB6 5300 bytes
font_01_sfnt_off00009ea3.bin
44399879e5e2cdd695c787ee3c95aa296cb5af3bf8c12c918d3b91806535b403
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA3 15868 bytes