Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8d0564d30e27f6…

MALICIOUS

PDF

42.6 KB Created: 2020-08-21 09:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68af3576fb4532de5778e3f5dd826833 SHA-1: f884383c592284aa5452a02dbbe3a0a1f86fc0e7 SHA-256: cf8d0564d30e27f6a7f213c3c9ec6645f9882f37e0b228366a0b8519bfd4ba91
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=converting+fractions+to+decimals+and+percentages+worksheets'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0434/6891/4838/files/30716586624.pdf'. The document body, though heavily obfuscated, contains the same redirector URL, suggesting an attempt to lure users to malicious infrastructure under the guise of educational worksheets.

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=converting+fractions+to+decimals+and+percentages+worksheets
    • http://files.eklavyadun.org/uploads/1/3/1/3/131398117/3520499.pdf
    • http://rafun.pninax.com/uploads/1/3/1/4/131453960/jemivilefepurun_gutevikibaga.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/30716586624.pdf
    • https://cdn.shopify.com/s/files/1/0445/1460/7263/files/harbor_breeze_ceiling_fan_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/lugenetesufesukomekevofed.pdf
    • https://cdn.shopify.com/s/files/1/0434/3857/1670/files/figuras_bidimensionales_y_tridimensionales_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/tusabibajigedudewilad.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/43914348874.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/zawuxataxiwotesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/67643448319.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_off00005893.bin
7a02a1e3b598321ed2e317e7db461a98ad2830a873cb5c89f15e32f35adf59ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5893 5596 bytes
font_01_sfnt_off00006b89.bin
6245ecfb7c4316c271d1b90c267ebe52606526d087cff98ea1adf3c95a50eeff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B89 10536 bytes
font_02_sfnt_off00008f56.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 4324 bytes

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