Malicious PDF — malware analysis report

Static analysis result for SHA-256 4911fbff941afab2…

MALICIOUS

PDF

45.3 KB Created: 2020-08-16 11:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6922be6623a44686a41268fa8c485c4f SHA-1: 8d1b7eb556fad0b581f3bb3f8815f59d0f94264f SHA-256: 4911fbff941afab2f0081b222183c9e3c188e4a9fcad8841da3547e3a6057906
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'free preschool coloring sheets' and includes the malicious URL. This suggests a social engineering lure to drive traffic to malicious infrastructure. No scripts were extracted, and the PDF structure itself is the primary vector for the malicious redirection.

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.ru/pify?keyword=free+preschool+coloring+sheets
    • http://files.khaagwa.org/uploads/1/3/0/8/130873983/a14dba72934e99.pdf
    • https://cdn.shopify.com/s/files/1/0438/2166/2365/files/fifudigafufageb.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/84730511749.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/bamiyan_menu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2505/files/pixuwurevatalage.pdf
    • https://cdn.shopify.com/s/files/1/0431/2979/8818/files/kizuxixelawez.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/gobuxi.pdf
    • https://cdn.shopify.com/s/files/1/0449/7742/2494/files/pawufewalof.pdf
    • https://cdn.shopify.com/s/files/1/0440/6955/2293/files/590321950.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/zavot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2956/0481/files/whatsapp_status_punjabi_love.pdf
    • https://cdn.shopify.com/s/files/1/0430/8375/9765/files/72164461334.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067da.bin
3249e8c3706b0a86f89f7879dc9d522616288b8e4ee255d48f1eea5dbc3e7c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DA 4728 bytes
font_01_sfnt_off000077db.bin
de14ccc17b37cb4a915ec1b58818d1f0fe19c32eeb5de8c8c4b4ae4910aa6745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 10036 bytes
font_02_sfnt_off00009a36.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A36 4324 bytes

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