Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28cdb7458bcd6c5…

MALICIOUS

PDF

43.0 KB Created: 2020-07-07 12:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d4102d9a687579acf3fa2ef2034c214 SHA-1: 833a337595446493cbcc305a301d87631dc3eca7 SHA-256: c28cdb7458bcd6c508580cbfb53a686f43073c164ff054709547aac112c6e175
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'area and perimeter word problems worksheets grade 4'. This URL redirects to ttraff.com, which is flagged as malicious. The PDF also contains a heuristic firing for PDF_SEO_LINK_FARM, suggesting it's part of a link farm designed to manipulate search engine results.

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/wb?keyword=area%20and%20perimeter%20word%20problems%20worksheets%20grade%204#area+and+perimeter+word+problems+worksheets+grade+4
    • http://files.letspaintarabic.com/uploads/1/3/1/3/131379612/22ab9b14a11.pdf
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdf
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdf
    • http://files.tenayaspeaks.com/uploads/1/3/1/6/131607239/5740736.pdf
    • http://files.condzellasfarm.com/uploads/1/3/0/9/130969555/97c8dd5b0b0479.pdf
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdf
    • http://files.priorityenvironmental.ca/uploads/1/3/2/7/132740415/poturowinu-pepurefeme-zomoxiru.pdf
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdf
    • https://dawedigukas920094907.files.wordpress.com/2020/06/kutasisaponoluvivuzotete.pdf
    • https://rejoxux.files.wordpress.com/2020/07/sugodokekeb.pdf
    • https://jogapodu.files.wordpress.com/2020/06/58304244085.pdf
    • https://nolomijavugi.files.wordpress.com/2020/06/90103308205.pdf
    • https://bufiliviputu.files.wordpress.com/2020/07/99935890691.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_off0000697b.bin
5c248c1cbc416e1d0dbfddf898fca83d831ec2e1a4954baf937255363641f695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 5532 bytes
font_01_sfnt_off00007c27.bin
51af0089869cd7b0e16c3d193c2b85d69b14d4236e247ee67170e8e3c785e47a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C27 10192 bytes

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