Malicious PDF — malware analysis report

Static analysis result for SHA-256 452c6140dcae80cb…

MALICIOUS

PDF

43.7 KB Created: 2020-08-08 12:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 623c3c5bedcfec84552be7af71defb96 SHA-1: 824186ea71de61fce98d731cd01448d2ede4c87e SHA-256: 452c6140dcae80cb2824f06d321ac1e45480ae575b22d6778def417e096e3b07
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com). The document body, though heavily obfuscated, contains text related to '5th grade math word problems worksheets with answers pdf', suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=5th+grade+math+word+problems+worksheets+with+answers+pdf
    • http://files.masterclass-series.com/uploads/1/3/0/8/130874347/e260f442aeba.pdf
    • http://xosudoz.craftimports.us/uploads/1/3/2/6/132695615/3041145.pdf
    • http://files.weikolin.com/uploads/1/3/2/7/132710763/dobogub.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/resefebeba.pdf
    • https://cdn.shopify.com/s/files/1/0437/7837/5831/files/bacteriological_water_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/66841567975.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1111/files/1488051281.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/83343525645.pdf
    • https://cdn.shopify.com/s/files/1/0435/8501/1871/files/69753773857.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1125/files/misuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/1234/9334/files/61526983683.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/famanawajoza.pdf
    • https://cdn.shopify.com/s/files/1/0437/3282/8314/files/77132101149.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/wafidamofale.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/seboxanova.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_off00006b88.bin
5b2e11240f1d20d925e97b9d7f8026dfbba7b23bdfe2823e68ba091fdf48958b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 5780 bytes
font_01_sfnt_off00007f13.bin
078b3f5ad71aa7ee12d0bbd82edc979301c70d54312992109889908744fa4a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F13 10104 bytes

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